Irises forum: using 10-10-10 fertilizer

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Name: Kari Walker
Hermosa Beach California
Do What You Absolutely Love To Do.
Feb 18, 2017 12:18 PM CST
I would say that this fertilizer would be OK if you were not wanting flowers.
Reason being that this will stimulate the plant to grow great leaves not leaving much energy for growing the flowers which are dependent on having a higher middle number in your fertilizer.
Name: Lucy
Hamilton, MA (Zone 6b)
Charter ATP Member Cottage Gardener Enjoys or suffers cold winters Region: United Kingdom Region: Northeast US Irises
Region: United States of America
Feb 18, 2017 2:47 PM CST
We use 5-10-10 if we can get it. Yours would work I suppose. But if is really important to keep the nitrogen as low as possible.
Name: Neal Linville
Winchester, KY (Zone 6a)
Charter ATP Member I was one of the first 300 contributors to the plant database! Bulbs Cottage Gardener Roses Irises
Garden Ideas: Level 2 Celebrating Gardening: 2015
Feb 19, 2017 6:53 AM CST
It depends on your soil too. I've been doing some home soil tests and finding deficiency in nitrogen and phosphorus, which was a bit of a surprise.

Its tough to make fertilizer recommendations without a proper soil test, so I think its best to err on the side of caution and fertilize sparingly.
"...and don't think the garden loses its ecstasy in winter. It's quiet, but the roots are down there riotous." Rumi
Name: Leslie
Durham, NC (Zone 8a)
Region: North Carolina Irises Cat Lover Garden Photography Enjoys or suffers hot summers Celebrating Gardening: 2015
Feb 19, 2017 8:29 AM CST
10-10-10 is recommended for Japanese and Louisiana Iris. Since they are watered more frequently they are heavier feeders.
My road calls me, lures me west, east, south & north; most roads lead men homewards, my road leads me forth. - John Masefield
Name: Niki
Bend, Oregon (Zone 6a)
Flowers are food for the soul.
Region: Oregon Bee Lover Butterflies Daylilies Dragonflies Frogs and Toads
Hummingbirder Irises Organic Gardener
Feb 19, 2017 11:20 AM CST
The soil here is notoriously poor in everything. I think the composted soil from the dump is good, l heard from some that it wasn't as high in nitrogen as others would like.
"The Earth laughs in flowers."
- Ralph Waldo Emerson
Name: Robin
Melbourne, Australia (Zone 10b)
Region: Australia Irises Garden Photography Cat Lover Seed Starter
Feb 20, 2017 6:16 PM CST
The Tempo Two catalog says "On planting use a balanced fertilizer that will last 3 to 9 months. Give a side dressing of balanced fertilizer in spring". I have just started using liquid 10-10-10 fertilizer which needs to be applied fortnightly and I won't know how well it aided flowering until spring (October)

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