Irises forum: Growing iris in pots?

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Name: Teresa
South central KY (Zone 6b)
Consider the lilies of the field
Seller of Garden Stuff Irises Hostas Region: Kentucky Lilies Peonies
Region: United States of America Garden Photography Vegetable Grower Hummingbirder Cat Lover Heucheras
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bluegrassmom
Jan 30, 2017 11:10 PM CST
Hello, this is the first winter that I have tried overwintering iris in pots. I am hoping for the best. So far we have had a fairly mild winter for zone 6. My first question is about fertilizing? When and how much. Thank you!


Name: Leslie
Durham, NC (Zone 8a)
Region: North Carolina Irises Cat Lover Garden Photography Enjoys or suffers hot summers Celebrating Gardening: 2015
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Lestv
Feb 1, 2017 12:03 PM CST
Hi Teresa. I have some in pots too. I don't usually fertilize them over the winter. If they were planted in a potting mix, or fertilized when potted then they should have plenty of nutrients.

About a month before bloom time is when they recommend you fertilize the planted iris. You could give the pots some at this time too. Just be careful to not get the fertilizer on the rhizome. Mix it gently in around the outer edges of the pot perhaps. I would go with a light application.

Hopefully others will also chime in with some advice. Smiling
My road calls me, lures me west, east, south & north; most roads lead men homewards, my road leads me forth. - John Masefield
Name: Teresa
South central KY (Zone 6b)
Consider the lilies of the field
Seller of Garden Stuff Irises Hostas Region: Kentucky Lilies Peonies
Region: United States of America Garden Photography Vegetable Grower Hummingbirder Cat Lover Heucheras
Image
bluegrassmom
Feb 2, 2017 8:33 PM CST
Thanks Leslie, I was wondering about how close before bloom time. Not now. I have been using Osmocote on my garden plants, so I plan to use that. Does a tablespoon sound like to much for a gallon pot?
Name: Gabriel/Gabe Rivera
Charlotte, NC (Zone 7b)
German imported, Michigan raised
Region: North Carolina Garden Photography Region: United States of America Hostas Enjoys or suffers hot summers Dog Lover
Garden Procrastinator Daylilies Plant and/or Seed Trader Irises Container Gardener Hybridizer
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Cuzz4short
Feb 2, 2017 11:27 PM CST
I just started using my Scott's superbloom again on all the pots. It can touch foliage and rhizomes since it's water saluable. I'll apply it once a week to already moist soil.

Otherwise as Leslie stated about a month before blooms, which is a tough guess these days. Just make sure to scratch it lightly into the soil, and water good. Depending on your pot drainage, 1tbsp and no more per pot. It does take time to break down, but you'll notice results really fast. Especially since they're waking up soon.
Gimme it and I'll grow it!
Name: Teresa
South central KY (Zone 6b)
Consider the lilies of the field
Seller of Garden Stuff Irises Hostas Region: Kentucky Lilies Peonies
Region: United States of America Garden Photography Vegetable Grower Hummingbirder Cat Lover Heucheras
Image
bluegrassmom
Feb 3, 2017 7:23 PM CST
Thanks, Gabe. Looking forward to seeing some new blooms.
Name: Charlotte
Salt Lake City, Utah (Zone 6b)
genealogist specializing in French
Irises Region: Utah Hostas Bulbs Heucheras
cbunny41
Feb 17, 2017 12:58 AM CST
@bluegrassmom
Teresa,

I looked up osmacote and its numbers are 19-6-12, not the optimum ratio for iris. Maybe someone else can comment who knows more than I do.
Name: Leslie
Durham, NC (Zone 8a)
Region: North Carolina Irises Cat Lover Garden Photography Enjoys or suffers hot summers Celebrating Gardening: 2015
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Lestv
Feb 17, 2017 9:17 AM CST
The 19 is high, and may be too much Nitrogen for a contained space like a pot. You can pick up some bulb food, like Sta-Green that is 4-10-10, or even Miracle Gro Shake N Feed for Roses (make sure it is the Rose formula) which is 9-18-9. Either of these can be used in the gardens as well.
My road calls me, lures me west, east, south & north; most roads lead men homewards, my road leads me forth. - John Masefield
Name: Jane H.
Kentucky (Zone 6b)
Irises Birds Region: United States of America Region: Kentucky Clematis
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janielouy
Feb 17, 2017 7:42 PM CST
I am wondering if you have irises that have been in pots that have formed a good root system, can you plant them in the ground now in Spring or will that mess them up or keep them from blooming? (Like they would bloom in a pot anyway?) Confused
Name: Leslie
Durham, NC (Zone 8a)
Region: North Carolina Irises Cat Lover Garden Photography Enjoys or suffers hot summers Celebrating Gardening: 2015
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Lestv
Feb 17, 2017 7:57 PM CST
They can be planted, but I would wait until there is no threat of prolonged freeze so the iris doesn't have stress while trying to establish itself. It may delay bloom, but I think that will vary by plant.

I had many iris bloom in pots last year! They did great.
My road calls me, lures me west, east, south & north; most roads lead men homewards, my road leads me forth. - John Masefield
Name: Gabriel/Gabe Rivera
Charlotte, NC (Zone 7b)
German imported, Michigan raised
Region: North Carolina Garden Photography Region: United States of America Hostas Enjoys or suffers hot summers Dog Lover
Garden Procrastinator Daylilies Plant and/or Seed Trader Irises Container Gardener Hybridizer
Image
Cuzz4short
Feb 17, 2017 9:00 PM CST
I had a more than few bloom last year when I made my first raised bed last March possibly.
Gimme it and I'll grow it!
Name: Teresa
South central KY (Zone 6b)
Consider the lilies of the field
Seller of Garden Stuff Irises Hostas Region: Kentucky Lilies Peonies
Region: United States of America Garden Photography Vegetable Grower Hummingbirder Cat Lover Heucheras
Image
bluegrassmom
Feb 19, 2017 8:57 PM CST
Thanks, Leslie for mentioning the ratios :)
Name: Leslie
Durham, NC (Zone 8a)
Region: North Carolina Irises Cat Lover Garden Photography Enjoys or suffers hot summers Celebrating Gardening: 2015
Image
Lestv
Feb 19, 2017 9:21 PM CST
Smiling
My road calls me, lures me west, east, south & north; most roads lead men homewards, my road leads me forth. - John Masefield

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