PlantsLavenders→Lavender (Lavandula x intermedia 'Grosso')

Common names:
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General Plant Information (Edit)
Plant Habit: Shrub
Life cycle: Perennial
Sun Requirements: Full Sun
Water Preferences: Mesic
Dry Mesic
Soil pH Preferences: Slightly alkaline (7.4 – 7.8)
Moderately alkaline (7.9 – 8.4)
Minimum cold hardiness: Zone 5a -28.9 °C (-20 °F) to -26.1 °C (-15 °F)
Maximum recommended zone: Zone 9b
Plant Height: 24-36 inches
Plant Spread: 36 inches
Leaves: Unusual foliage color
Other: silver-green to grey-green
Flowers: Showy
Blooms on new wood
Flower Color: Purple
Bloom Size: Under 1"
Flower Time: Summer
Suitable Locations: Xeriscapic
Uses: Windbreak or Hedge
Medicinal Herb
Cut Flower
Dried Flower
Suitable as Annual
Wildlife Attractant: Bees
Resistances: Deer Resistant
Rabbit Resistant
Drought tolerant
Salt tolerant
Toxicity: Other: can be allergenic; has the highest oil content of all lavenders; more camphorous than other varieties and not generally considered culinary
Propagation: Seeds: Can handle transplanting
Other info: 'Grosso' is a hybrid with infertile seed; generally propagated with softwood cuttings
Propagation: Other methods: Cuttings: Tip
Other: Cut tender shoots that are around 2-4 in long with around 3-5 nodes. Avoid woody stems. Cut just below the last node.
Pollinators: Hoverflies
Moths and Butterflies
Containers: Suitable in 3 gallon or larger
Needs excellent drainage in pots
Miscellaneous: Tolerates poor soil
Parentage: Lavandula angustifolia x Lavandula latifolia


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Photo gallery:
Location: My garden in KentuckyDate: 2006-12-30
By Marilyn
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Location: My garden, Pequea, PA 17565Date: 2016-07-04
By csandt
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Location: My garden in KentuckyDate: 2006-06-17 at 7:49 pmEvening sun shining on the left side of the plant.
By Marilyn
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Location: My Garden, Washington StateDate: 2017-08-27
By missmaven
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Location: My garden in KentuckyDate: Jul 7, 2005 6:19 PMGive this Lavender plenty of space
By Marilyn
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Location: 382 River Road, Pequea, PA 17565Date: June 18, 2015Lavandula x intermedia 'Grosso'
By csandt
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Location: My garden, Pequea, Pennsylvania 17565Date: 2017-05-16
By csandt
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Photo courtesy of Singing Tree Gardens Nursery
By Joy
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Photo courtesy of Joy Creek Nursery
By Joy
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Image Courtesy of Bloomin Designs Nursery Used with Permission
By Joy
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Posted by Marilyn (Kentucky - Zone 6a) on Jan 24, 2012 7:52 PM

When I planted Lavender 'Grosso' years ago, I made sure that the soil was well draining, lean, not fertilized, had added lime, and had all-purpose sand mixed in I also added pea gravel and/or small crushed gravel to the top as its mulch.

I never did fertilize 'Grosso' the whole time I had it. The only reason it's not in my flowerbed anymore is that I decided to plant other flowers in the flower bed.

I made sure to allow 2 to 3 ft for spacing because it's a Lavender that needs a lot of space to look its best, as you can see in my photos. The photos were taken years after I had planted it and a year before I dug it out.

During the growing season, as the stems of flowers faded, I'd cut the stems to promote more flowering. Sometimes I'd cut fresh flowering stems to take into the house. The fragrance is wonderful!

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Posted by csandt (Lancaster County, Pennsylvania - Zone 6b) on Aug 21, 2015 3:32 AM

Lavender is a must-have plant for me! I tried growing lavender 'Hidcote", 'Munstead' and 'Augustifolia' at various locations on my windy hilltop before finding 'Grosso', a French cultivar used for its fragrance in perfumes, etc. Sadly, in open, sunny locations, all the 'Hidcote', 'Munstead' and 'Augustifolia' plants died. In a protected area with morning sun, they thrived but grew woody and ugly after a couple of years.

Then I tried 'Grosso' in the protected location and have been very pleased. It produced a nice mound that did not develop the ugly woodiness of the two other cultivars I have tried. 'Grosso' has survived two severe winters in the protected location, although it did not survive the open, sunny spot.

I may be butchering lavender nomenclature by calling species cultivars. Please forgive (and educate) me!

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Plant Events from our members
paleohunter On September 7, 2020 Maintenance performed
paleohunter On September 7, 2020 Cuttings took
carpathiangirl On April 24, 2019 Obtained plant
3 in. start
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Discussion Threads about this plant
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