Introduction

A favorite spring blooming bulb, tulips are anticipated worldwide as a sign of spring. Tulip blooms come in a vast array of options in bloom color, petal differences (fringed, ruffles, single and double rows), plant height (6 inches to two feet) , blooms size, and bloom time (early, mid, and late-spring).

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About tulips

From stately formal plantings, containers, or naturalized woodland areas, there's a type of tulip for every garden setting. Tulips grow best in areas with cold winters, cool springs, and cool summers. The smaller species and heirloom tulips are reliably perennial, while larger, newer variety types usually need to be replanted every few years, or even every year for reliable blooms. By planting varieties with different bloom times, you can have tulips blooming from early to late spring. Some types are good for forcing into bloom indoors, and all varieties can be grown in containers.

Growing Zones for Tulips

Tulips can be grown in zones 3-7. In warmer zones, gardeners can purchase pre-chilled bulbs (or chill them yourself in a refrigerator for 10 weeks) , plant in winter, and grow as an annual.

Choosing a site to grow tulips

Select a site with full sun to light shade and well-drained soil. Tall varieties should be sheltered from strong winds.

Planting Instructions for Tulips

Plant tulip bulbs in fall, six to eight weeks before a hard frost is expected and when soils are below 60 degrees F. This is usually during September and October in the north, and October and November in the south. Prepare the garden bed by using a garden fork or tiller to loosen the soil to a depth of 12 to 15 inches, then mix in a 2- to 4-inch layer of compost. Dig a hole about three times as deep as the height of the bulb. Set the bulb in the hole, pointy end up, then cover with soil and press firmly. Space bulbs 4 to 6 inches apart. Water thoroughly after planting.

Fertilizer for Tulips

Tulips should only be fertilized in the fall if growing as a perennial. This is when the bulbs are sending out roots and storing up nutrients for next spring's bloom. Whether newly planted or established bulbs, do not fertilize in the planting hole or dig down. Instead, spread your fertilizer on top of the soil; this is known as top-dressing. Choose a slow release fertilizer 9-9-6 made for bulbs or mix If growing as an annual, you do not need to fertilize.

Tulip Pests and Problems

Easy to grow, tulips are not faced with many problems. Let's cover the most popular ones:

  1. Disappearing bulbs: Plant bulbs in buried wire cages to protect them from getting eaten.

  2. Blossom stalks are short: Not enough chilling; unseasonably warm winter and spring temperatures

  3. Leaves appear, but plants don't bloom: Not enough chilling; leaves removed too soon the previous year; poor soil fertility; not enough sun

  4. Over the years, fewer plants and blossoms appear: Decline due to overcrowding, poor soil fertility, increasing shade

Ongoing Care for Tulips

Keep tulips watered during dry periods.

After plants are finished flowering in spring, cut back flower stalks but allow the leaves to die back naturally, hiding the unsightly foliage with annual or perennial plantings.

If bulbs have become crowded and are competing, dig and divide them. Reduce competition from surrounding plants by weeding and mowing regularly.

Growing Species (Botanical) Tulips

Species tulips are small, hardy wildflowers of the tulip family that are more reliably perennial than hybrid tulips. Under optimal conditions, they will come back year after year and usually increase in numbers. Species tulips are less vulnerable to stormy spring weather, and their generally short stems (6 to 12 inches) don't bend in strong winds. They tolerate partial shade and are excellent for naturalizing in rock gardens, woodland areas, and perennial borders.

Species tulips propagate quickest given full sun but tolerate partial shade. The primary cultural requirement is well-drained soil; sandy soil is best. If your garden lacks good drainage, work fully composted pine bark or similar organic amendment into the soil. Plant species tulips 4 to 6 inches below the surface, spaced 2 to 6 inches apart. Encourage bulbs to multiply by leaving faded flower heads attached so that seeds can mature and spread. Allow leaves to remain until they turn yellow and fall over naturally; the bulbs use this time to continue photosynthesis and store nutrients for next year. Apply 4 to 5 pounds of 9-9-6 fertilizer per 100 square feet each fall. Species tulips are dormant in summer and prefer dry soil then, but adapt well to garden situations.

For mild-winter climates (zones 8 through 10), recommended species tulips include lady tulip (Tulipa clusiana), Candia tulip (T. saxatilis), and Florentine tulip (T. sylvestris). These do not require chilling before planting in these regions and will flower reliably in spring and likely for many springs to come.

Forcing Tulips Indoors

You can force tulips to bloom indoors during winter. Select bulbs suited for forcing, generally shorter, more compact varieties like 'Red Riding Hood' and 'Stresa', though some taller types such as 'Apricot Beauty', 'Calgary', and 'Gudoshnik' also work well. Choose top-quality bulbs that are large and heavy for their size, avoiding ones that are soft, moldy, or whose papery outer layer is missing.

Most tulips require about 14 weeks of temperatures below 48 degrees F, followed by 2 to 3 weeks at 60 to 65 degrees F to flower. Some varieties like 'Brilliant Star' and 'Christmas Dream' require only 10 weeks below 48 degrees F and can produce holiday blooms if started in mid-September. For staggered bloom after the New Year, start bulbs as soon as they are available, but no later than early October.

Place at least 2 inches of moistened soilless potting mix in the bottom of clean pots, and position bulbs root end down so that their tops sit just below the rim. Plant bulbs as close together as possible without touching. After planting, water thoroughly and move pots to a dark location with steady temperatures between 35 and 48 degrees F (40 degrees F is ideal). An unheated garage, basement, or refrigerator is perfect. After 8 to 16 weeks of rooting (depending on variety), when healthy roots are visible at drainage holes, transfer pots to a location with bright indirect light at 50 to 65 degrees F for two weeks. Then move to a sunny window at 68 degrees F to stimulate flowering. As soon as buds begin to color, return pots to indirect light for longer bloom. Keep nights cool at 60 degrees F to extend bloom time to about 10 days. Forced tulips rarely flower again if planted in the garden, though you can try by removing the spent flower, allowing the bulb to complete its life cycle, then planting outdoors.

Combining Tulips with Other Plants

Although tulips look spectacular massed in beds, they look even better when combined with other bulbs, annual and perennial flowers, or shrubs. When combining tulips with other plants, consider color, bloom season, and height.

Tulips with other bulbs: Extend the bloom season by including bulbs that flower before, during, and after tulips. Plant lower-growing bulbs in front of taller varieties. Successful combinations include red 'Showwinner' tulips with 'Giant White' crocus, or pink 'Angelique' tulip with pink 'Rosy Clouds' daffodil.

Tulips with annual flowers: Plant low-growing annuals in front of taller tulip varieties. In warm-winter areas, plant annuals with tulip bulbs in fall. In cold-winter areas, plant annuals in spring as soon as you see first tulip shoots emerge. Good combinations include purple-white 'Shirley' tulip with white-purple-yellow 'Johnny Jump Up' violas, or 'Apricot Beauty' tulip with blue forget-me-nots.

Tulips with perennial flowers: These combinations are low-maintenance and can be repeated yearly. Perennials may need to be divided or thinned after a few years to leave room for planting tulips around them. Consider perennials that hide dying tulip foliage after bloom, such as daylilies. Good combinations include black 'Queen of the Night' tulip with basket-of-gold, pink 'Angelique' tulip with bleeding heart, or 'Blue Parrot' tulip with Virginia bluebells.

Tulips with spring-blooming shrubs: Plant tulips in front of or around spring-blooming shrubs for stunning effect. Try 'White Emperor' tulip with dwarf red Japanese barberry, red-yellow 'King Edward' tulip with yellow forsythia, or pink 'Angelique' tulip with pink flowering almond.

When planting tulips around existing plants, be careful not to damage root systems. Because bulbs will compete with flowers or shrubs for water and nutrients, keep the area well-fertilized and watered, especially in spring and fall. Add compost at planting time and fertilize with a high phosphorus, moderate to low nitrogen fertilizer.

Naturalizing with Tulips

Species tulips and hybrids of Tulipa fosteriana, T. greigii, and T. kaufmanniana are ideal candidates for naturalizing, as they spread rapidly by seed, stolons, and bulblets. In an open space, plant at least 100 bulbs per 12 square feet to make an impact. For smaller nooks or to accent a rock garden, fewer bulbs are needed.

For naturalistic plantings, lay bulbs out in informal masses with curved borders and asymmetrical shapes. Within the marked area, spread odd numbers of bulbs (three, five, or seven in a group), since even numbers are more formal-looking. Make spacing between groups random. Plant bulbs 4 to 6 inches below the surface or three times their widest diameter. In sandy soil, plant deeper; in clay soils, shallower. Space species tulips according to supplier instructions, usually 2 to 6 inches apart.

In spring, water growing plants if the garden doesn't receive about one-half inch of rain weekly. Feed tulips a few times with half-strength liquid fertilizer during active growth: once when leaves have fully emerged, once after flowering, and again two weeks later if leaves are still green. Use fertilizer lower in nitrogen and higher in phosphorus and potassium (such as 9-9-6 analysis). Sprinkle one-half inch of aged manure or compost over the area in early spring. Allow bulb foliage to remain in place until it fades completely to ensure bulbs have energy to multiply. Mow the naturalized bed a few times over summer and fall to remove competing plants and keep the area open. Encourage these tulips' multiplying tendencies by leaving faded flower heads attached so that seeds can mature and spread.

Frequently Asked Questions about Tulips

A tulip bulb is a battery, and the leaves are what charges it. Nearly every question about tulips is really a question about whether the foliage got what it needed before it died back.

Deer stripped my tulips the night the flower buds appeared and left no leaves. Can the bulbs be saved, and should I dig them up now?

Leave them in the ground. Digging now is the one thing that would guarantee you lose them.

Here is what is going on inside the plant. The bulb you planted last fall contained a fully formed flower and enough stored food to push it up. Once that is spent, the bulb is nearly empty, and everything about next year depends on the leaves rebuilding it over the following six to eight weeks. Losing the flower costs you this year's bloom and nothing more. Losing the leaves is what kills the bulb's future.

So the question is how much leaf you still have or can still get. Tulip foliage elongates as it grows, and the lower leaves are often still short and partly below the soil surface when the flower stem is at browsing height, which is why deer so often take the top and leave something behind. Give it a few weeks. More leaf frequently appears above the soil line after a browse, and even one or two full leaves per bulb rebuilds something.

Whatever comes up, protect it and let it finish. Do not cut, braid, tie or fold the foliage. Let it grow, then yellow, then dry and pull away on its own, which usually means late June or early July depending on your climate. Water enough that the ground stays evenly damp without ever being waterlogged for as long as the leaves are green, since the bulb cannot rebuild in dry soil. A single application of a balanced water soluble fertilizer at the label rate while the leaves are actively growing is reasonable, and more than that is not.

Be realistic about the result. Tulips are short lived in most gardens even when nothing eats them, and a bulb that lost its foliage early will likely come back smaller and may produce only leaves next spring before recovering the year after, or may not come back at all. That is not a failure on your part.

Then deal with the deer, because this will happen again. Tulips are one of the most reliably eaten plants in North American gardens, flower buds first. Repellents work if you start before the shoots emerge and reapply every week or two and after every rain, rotating between products so the animals do not habituate; a repellent applied after the first browse is closing the barn door. Physical exclusion is the only certain method: fencing at least eight feet high, or a temporary cage of wire mesh over the clump through the four weeks when the buds are vulnerable. If you would rather stop fighting, daffodils, alliums, camassia, snowdrops, hyacinths and fritillaria are all bulbs that deer avoid, and interplanting tulips among daffodils and alliums helps somewhat. Rodents are the other half of the problem: voles, mice, chipmunks and squirrels all eat tulip bulbs, and a cage of hardware cloth under and over the planting is the real defense there.

My tulip stems are drooping or cut clean through, halfway up. I cut the stems open and found no insects. What is doing it?

There are two distinct problems in that description and it helps to separate them, because a clean severed cut and a shriveled drooping section have different causes.

Deal with the clean cuts first. Something cut those, and the shape of the cut names the culprit. Rabbits bite through a stem at a sharp angle, leaving a cut so clean that people routinely assume scissors, and they take the flower and leave it lying. They feed at dusk and dawn, so you will not see them at midday. Deer, by contrast, have no upper incisors and tear rather than cut, leaving a ragged crushed end, and they usually take whole flowers rather than dropping them. Squirrels and chipmunks nip stems off to reach the bud or simply out of habit, and often leave the flower head a short distance away. Voles cut stems near or just below the soil line. Look for droppings, tracks in soft soil, and browsing on other plants, and check the height of the damage above the ground, since rabbit damage is usually within a foot or so.

The withered droop is a different matter and you should look at it closely. Cut one of those stems just below the shriveled point and examine the outside of the stem carefully in good light. If you find a small sunken tan or gray spot with a darker margin, sometimes with fuzzy gray growth on it in damp weather, girdling the stem exactly where it folded, that is tulip fire, the fungal disease Botrytis tulipae. It is the most common serious disease of tulips and the classic symptom is exactly that: a lesion partway up the stem that weakens it until the flower topples. The other signs that confirm it are small pale or water soaked spots on the leaves that enlarge into gray brown blotches, distorted or scorched looking new shoots, and a general burnt appearance to the planting.

If it is tulip fire, act now rather than next year. Remove and bag every affected plant, including the bulb beneath it, and do not compost any of it, because the fungus overwinters as small hard black bodies on the bulb and in the soil. Clear all the fallen petals and dead foliage from the bed. Do not plant tulips in that ground for at least three years, ideally longer. When you replant elsewhere, inspect every bulb and discard any with dark sunken spots on the skin, plant at wide spacing in a sunny site with good air movement, water at the soil rather than over the foliage, and avoid overhead irrigation in spring. There is no home treatment that cures an infected planting, and a fungicide is neither necessary nor sufficient here; sanitation and rotation are the control.

Three other causes are worth ruling out if neither of those fits. A hard frost after the buds have risen kills a band of stem tissue and produces exactly this kind of collapse, so think back to whether you had a cold snap after growth was well up. Cutworms chew stems near the base at night and hide in the soil by day, so scratch the soil around a damaged plant an inch or two down and look for a curled gray caterpillar. And there is a physiological disorder known as tulip topple, a calcium related weakness in fast growing stems most often seen in forced bulbs and in warm bright springs, where the stem collapses just below the flower with no lesion and no insect present. It is not a disease, it is not treatable, and it does not recur reliably.

I was given a pot of forced tulips in full bloom in February. When can I move them outdoors?

Not yet, and probably not to much effect, but there is a right way to give them their best chance.

Forced bulbs have been chilled artificially and then brought into warmth so they bloom months ahead of the season. The plant in front of you is in the middle of May, physiologically, while your garden is still in February. Its leaves are soft, unhardened tissue with no cold tolerance, and putting the pot outside now, or planting it, will freeze the foliage off and end the bulb's chance of rebuilding itself.

So do this instead. Enjoy the flowers, and cut each one off at the top of the stem as it fades, leaving all the leaves and as much stem as you can, which stops the plant putting anything into seed. Then move the pot to the brightest, coolest place you have that stays above freezing: an unheated sunroom, a cool bedroom window, an enclosed porch. Cool and bright keeps the foliage working as long as possible, and warm and dim is what makes it collapse in ten days. Water enough to keep the mix moist and feed once or twice at the label rate with a balanced water soluble fertilizer while the leaves are green.

What happens next depends on the calendar. If the foliage is still green and healthy when your weather has genuinely moderated and hard freezes are behind you, plant the whole root ball out in a sunny, well drained bed at normal tulip depth, about six to eight inches to the base of the bulb, and let the leaves finish naturally in the ground. If instead the leaves yellow and wither while the bulbs are still in the pot, which is common, let them dry completely, lift the bulbs, brush off the mix, discard anything soft or moldy, and store the firm ones in a paper bag in a cool dry place until fall planting.

Then set your expectations low, honestly. Forcing is hard on a bulb, and it usually takes a year off before it blooms again, so a season of leaves only is the normal outcome and the flowers when they return are often smaller. Many forcing varieties are chosen for how they behave in a greenhouse rather than for garden performance, so some never settle in at all. It is worth trying, since the alternative is the compost heap, but buy garden tulips in fall if what you want is a display next spring.

Can I grow tulips in a hot climate, in a bed with morning shade and afternoon western sun?

You can grow them, but treat them as annuals, and change the exposure if you can, because that particular light pattern is the harder of the two.

On climate first. Tulips need a long cold period, roughly twelve to sixteen weeks below about forty five degrees Fahrenheit, to initiate a flower inside the bulb. In zones 8 and higher the winter soil never gets cold enough for long enough, so a bulb that bloomed beautifully its first spring on the chilling it received before you bought it produces nothing but leaves the second year, and then declines. That is not something you can fix with feeding or siting. Gardeners in warm zones who grow tulips successfully buy fresh bulbs every fall, pre chill them in a refrigerator for ten to fourteen weeks in a paper or mesh bag away from fruit, since ripening fruit gives off ethylene that aborts the flower, plant them as late as the soil allows in December or early January, enjoy one excellent spring, then pull them out and plant something else. If you want a bulb that comes back for years in that climate, plant daffodils and paperwhites, bearded iris, amaryllis, rain lily, crinum, or species tulips and Dutch iris.

On the exposure, morning shade with late afternoon western sun is the reverse of what any bulb wants in a hot climate. Late afternoon sun in the desert Southwest is the hottest, most desiccating light of the day, striking a bed that has been heating all afternoon and is often reflecting off a nearby wall or paving. Morning sun with afternoon shade lets the plant photosynthesize in cool light and then rest, which is why almost every heat climate planting guide asks for it. If there is any flexibility on placement, that is the change worth making. If there is not, grow the tulips in pots you can set where the light suits them, or accept a shorter display and cooler colors, since dark reds and purples fade fastest in that light.

Container growing is genuinely the better route in a hot climate. Pre chilled bulbs in a large pot of free draining mix, planted close together for effect, watered when the top inch dries, sited in morning sun and afternoon shade, will give you a better display than the same bulbs in the ground.

Will bulbs come up through weed barrier fabric, and can I replant bulbs that have been sitting in the garage?

Replant them now, today if you can. Bulbs out of the ground are living tissue slowly drying out, and a few weeks in a garage is survivable while a few months is not. Check each one, plant everything firm, and discard anything that has gone soft, light and papery, or is showing blue green mold through the skin.

On the fabric, no, and do not use it where bulbs are planted. Woven and spun landscape fabrics are designed to stop growth coming through them, and they do not distinguish between a weed shoot and a tulip. Even where a shoot finds a gap, the fabric interferes with the annual cycle these plants need: bulbs have to send shoots up freely each spring, and many multiply by offsets and by seeding themselves around, which fabric prevents entirely. Fabric also tends to fail in the medium term everywhere, not just over bulbs, because windblown soil and decaying mulch build a layer of growing medium on top of it, weeds root into that layer and through the fabric, and after a few years you have a bed you cannot weed and cannot dig without pulling up shredded plastic.

Use a three inch layer of organic mulch instead: compost, shredded bark, leaf mold or pine straw. It smothers germinating weed seeds by keeping light off the soil surface, bulb shoots push straight through it, and it feeds the soil as it breaks down rather than sealing it off. Keep it at a fairly even three inches, since much thinner does not suppress weeds and much thicker can hold too much moisture around a bulb, and top it up annually. When a weed does come through, it pulls easily out of loose mulch, which is not true of one rooted into fabric.

While you are planting, set the bulbs about three times their own height deep, roughly six to eight inches to the base for a full sized tulip and a similar depth for daffodils, pointed end up, in ground that drains. Deeper planting also puts the bulbs out of easy reach of squirrels and reduces the chance a warm spell pushes them into growth too early.

My bulbs sat in plastic bags in a closet for weeks. A few are moldy, a few have short shoots, and none feel soft. Should I plant them?

Plant them, and plant them today. Bulbs in that condition have nothing to gain from further storage.

The mold on the outside is usually a surface growth on the papery tunic rather than an infection of the bulb, and the fact that they are still firm is the piece of information that matters. A tulip bulb is either firm and heavy for its size, in which case it is alive and worth planting, or soft, spongy, light or oozing, in which case it is not. Brush the loose moldy tunic off gently, then look at the base plate, the flat disc at the bottom where the roots emerge. It should be firm and dry. Discard any bulb that is soft there, and discard any with dark sunken spots on the flesh beneath the skin, since that is the sign of tulip fire rather than harmless storage mold.

The sprouts are fine and you should protect them. Do not snap them off; that shoot contains this year's flower. Plant at the normal depth, about six to eight inches to the base of the bulb, and handle the sprouted ones carefully as you set them in the hole. If a sprout is long enough that normal depth would bury the tip, plant a little shallower and mulch over the top rather than cutting anything off.

Soft, warm ground in a mild December is workable planting weather in the Northeast and you have not missed the window. Tulips can go in any time the soil can be dug, and late planting in cold soil is usually better for them than early planting in warm soil, since it reduces the chance of premature top growth. Water them in once after planting.

The lesson for next time is about the plastic. Bulbs respire, and a sealed plastic bag traps the moisture they give off, which is what grew the mold and what starts the rot that ruins a batch. Store bulbs in paper bags, mesh sacks, or open trays in a single layer, somewhere cool, dry, dark and well ventilated, away from ripening fruit. Better still, plant them when you get them. A bulb in the ground is storing itself.

I moved sprouted container bulbs into the sun and the sprouts turned reddish. Did I put them out too early?

Most likely there is nothing wrong at all, and reddish tulip foliage is one of those things that alarms people every spring without meaning anything.

Reddish pigment in tulip leaves and shoots has three ordinary explanations. Many tulips simply have it, particularly species types and some of the early and viridiflora sorts, where the leaves are naturally mottled, edged or flushed with maroon and stay that way all season. Second, cool bright weather produces anthocyanin pigments in young foliage on all sorts of plants, and it fades as temperatures rise and growth speeds up. That is very likely what you are seeing if you have just moved shoots that grew in the dark of a storage box into full sun. Third, phosphorus is less available to roots in cold soil, and a temporary purplish cast is a common early spring symptom in containers, which also passes.

Note what sun damage would look like instead. Foliage that has been scorched dries out: it goes pale, then papery or bleached, then tan at the tips and margins, and the affected tissue is dead rather than colored. Tissue that has been etiolated in a dark box and then moved abruptly into strong sun can indeed scorch, so if you see pale bleached patches rather than red pigment, move the pot to a spot with morning sun only for a week and then bring it back out gradually.

One uncommon possibility is worth naming so you can rule it out. If reddish foliage comes with wilting despite moist soil, and the shoots are stunted or distorted, dig into the pot and look at the bulb. A bulb rotting at the base, or with dark sunken lesions and the beginnings of gray fuzz, means crown rot or tulip fire, and the response is to bin the bulb and the potting mix, in the trash rather than the compost, and wash and disinfect the pot before reusing it. This is genuinely unusual in tulips, and healthy color with healthy growth is not it.

Are tulip bulbs dangerous to children, pets, or the people handling them?

Yes, in modest ways worth knowing about, and this is the part of tulip growing that rarely gets mentioned.

Tulip bulbs are poisonous if eaten. They contain compounds called tulipalins, concentrated in the bulb and highest in the papery outer layers, and they cause vomiting, drooling, diarrhea and abdominal pain. Dogs are the usual victims, because a bulb newly planted in loose soil is exactly the sort of thing a dog digs up, and large quantities can produce more serious effects including breathing difficulty and heart rhythm changes. Cats are affected too. If a pet has eaten bulbs, call your veterinarian or an animal poison control service promptly rather than waiting for symptoms. If a child has eaten any part of a bulb, call poison control or your doctor. Store bulbs where neither can reach them, which is not the open bag in the garage, and consider hardware cloth over new plantings where a dog digs.

Handling matters too. The same compounds cause a contact dermatitis well documented in bulb handlers, an itchy, cracked, reddened skin condition on the fingertips and under the nails that develops after repeated handling of bulbs, and some people react to the sap of cut stems as well. Wear gloves when you are planting a large quantity or dividing bulbs, wash your hands afterward, and see a doctor if a rash persists or spreads.

None of this makes tulips a plant to avoid. It makes them a plant to plant with gloves on and to keep the bag off the floor.

The tulip foliage was mowed off while still green. Are the bulbs ruined?

Not ruined, but docked a year. Spring foliage is what refuels the bulb after bloom, so leaves lost while green take that season's investment with them: expect weak flowers or none next spring. The leaves will return, though, and spend the following season rebuilding the bulb, so recovery normally comes the year after. One early mowing costs a bloom cycle, not the planting.

Can I force tulips to bloom by a specific date?

Approximately, with hedging. Count on 14 to 17 weeks from potting to flower, roughly 10 of them chilling, and work backward from the target date to find your potting window. Home forcing controls temperature but not the light and moisture a commercial greenhouse manages, so results scatter; stagger pots in weekly batches so some run ahead of the date and some behind. Be honest about the alternative too: flowering tulips are usually for sale in your target season, without the refrigerator logistics.

Can tulips be made to bloom in late summer?

No. The cycle needs winter cold, then a long spring of foliage growth, then dormancy, and there is no room in it for a second performance before fall. This is the plant, not your technique. For high-summer flowers, plant dahlias, zinnias, or other true summer bloomers instead.

Why are my tulips changing color or developing stripes?

Two very different causes. A color shift across a whole bed is almost always attrition: mixed plantings contain cultivars of unequal vigor, the weak ones fade out over a few years, and the survivors' colors take over. True tulip breaking virus is different and shows as distinct feathered streaks on individual flowers. Those streaks were prized historically, but the virus weakens the plant and spreads by aphids to other tulips and to lilies, so remove infected bulbs and keep aphids down rather than keeping the pretty stripes.

My tulips grew leaves but never bloomed their first year. What went wrong?

Not enough chilling, most likely: tulips need about 12 to 14 weeks between freezing and 40 degrees F, and short-chilled bulbs abort or malform their flowers. Leave the foliage entirely alone to fade on its own, since it is rebuilding the bulb; do not cut, braid, or tie it. Mulch once hard freezes arrive to keep soil temperature steady, feed in spring at the label rate while foliage grows, and work in compost. With a full winter's chill the planting should flower the next spring; if it still refuses, ask extension which varieties perform in your climate.

What actually keeps rabbits and squirrels off tulips?

Exclusion; animals adapt to everything else. For rabbits, a chicken-wire fence at least 2 feet tall with the bottom buried 6 inches so they cannot tunnel under. For squirrels, lay stiff wire mesh flat over the soil, which they will not walk on, and keep the lowest branches of nearby trees 6 feet up to remove launch perches. Repellents, predator urine, and blood meal fade fast as animals habituate, and homemade cayenne or garlic sprays are eye and airway irritants to the person applying them and are not registered for the use, so skip them. Where rodent pressure is relentless, the elegant fix is planting daffodils instead: their bulbs are toxic and rodents leave them alone.