Post a reply

Image
Aug 27, 2015 3:32 PM CST
Name: Richard
Joshua Tree (Zone 9a)
Birds Herbs Irises Ponds Plant and/or Seed Trader
What brand of fertilizers do you use for your irises? I need to give my irises (older ones anyway) a little feed before the fall here soon. I know I have read that Epsom salts help when its about time to produce flowers. Any help is appreciated.
Image
Aug 27, 2015 3:45 PM CST
Name: Jane H.
Kentucky (Zone 6b)
Birds Region: Kentucky Clematis Daylilies Irises Region: United States of America
Good question. I have heard you fertilize them one month after bloom and in the spring before bloom but do not know what to do now.
Image
Aug 27, 2015 4:19 PM CST
Name: Jen Jax
Northern Kentucky (Zone 6a)
Region: Kentucky Dog Lover Irises Peonies Enjoys or suffers cold winters
I use 10-10-10 you just sprinkle it around and done!

I have one row I am trying out rabbit manure. But that's a test plot so we will see.
Image
Aug 27, 2015 4:29 PM CST
(Zone 9b)
Region: California Garden Ideas: Level 1
I use 6-20-10 and get a 50lb bag of it at Horizons for about $27. I also use some alfalfa pellets, but make sure you buy some that have no additives, such as salt. I bought the pellets at a animal feed store nearby and I don't recall the brand name.
Avatar for irisfirefighter
Aug 27, 2015 5:28 PM CST
Name: Cory
Elkhart Co., IN
Charter ATP Member Irises
I done the same as Jen does with triple 10. What ever brand I can get. That reminds me I should do this. Way to many things going on.
Cory, Firefighter/EMT
Image
Aug 27, 2015 5:31 PM CST
Name: Jane H.
Kentucky (Zone 6b)
Birds Region: Kentucky Clematis Daylilies Irises Region: United States of America
I have a big bag of alfalfa pellets that I bought at a feed store and used one season but I think they may cause mold when we have lots of rain. Does anyone know if that is the case? Also what about Epson salts?
Image
Aug 27, 2015 5:46 PM CST
Name: Richard
Joshua Tree (Zone 9a)
Birds Herbs Irises Ponds Plant and/or Seed Trader
Cory, I think that's all of us now a days I think. Just a lot going on.

Jane, I have heard some use Epson (Epsom) salts during the growing season, but not have heard about the alfalfa pellets.
Image
Aug 27, 2015 6:29 PM CST
Name: Bonnie Sojourner
Harris Brake Lake, Arkansas (Zone 7a)
Magnolia zone
Region: United States of America Region: Arkansas Master Gardener: Arkansas Irises Plant and/or Seed Trader Moon Gardener
Garden Ideas: Master Level Dragonflies Bulbs Garden Art Celebrating Gardening: 2015 Gardens in Buckets
I don't use fertilizers high in nitrogen. I think it encourages rot. everything you add, such as alfalfa pellets, has a little, or a lot, of fertilizer in it. if you are using a multitude of treatments then you may not need regular fertilizer. Research all the home remedies and additives, get a soil pH test and then decide what you need to feed your irises.
Thro' all the tumult and the strife I hear the music ringing; It finds an echo in my soul— How can I keep from singing?
Image
Aug 27, 2015 6:31 PM CST
Name: Tom
Southern Wisconsin (Zone 5b)
Butterflies Vegetable Grower Keeper of Poultry Irises Keeps Horses Dog Lover
Daylilies Cat Lover Region: Wisconsin Celebrating Gardening: 2015
In our area it's not a good idea to fertilize in the fall. The new growth isn't strong/hardened off enough to withstand the winter and it can cause death and rot. I only fertilize in the spring with a balanced fertilizer. The super phosphate fertilizers aren't legal here any more, as it leaches into the water supply and causes problems.
Politicians are like diapers, they need to be changed often, and for the same reason.
Image
Aug 27, 2015 6:33 PM CST
Name: Jane H.
Kentucky (Zone 6b)
Birds Region: Kentucky Clematis Daylilies Irises Region: United States of America
Maybe at first do no harm is the rule. Sometimes a little may be too much if you are doing all kinds of things at once.
Image
Aug 27, 2015 7:14 PM CST
Name: Jen Jax
Northern Kentucky (Zone 6a)
Region: Kentucky Dog Lover Irises Peonies Enjoys or suffers cold winters
I'm think as long as you make sure you test soil yearly you can pretty much do what ever you want to try to see if it works for your soil or not. I test my soil 2 times a year. Never had a problem.m. Now I also drop lime and gypsum in late fall so it's all fresh come spring.
Avatar for crowrita1
Aug 27, 2015 7:28 PM CST
Name: Arlyn
Whiteside County, Illinois (Zone 5a)
Beekeeper Region: Illinois Irises Celebrating Gardening: 2015
I agree with Tom, ....I wouldn't fertilize them now.........besides causing a "growth spurt" at the wrong time, most of you fertilizer $ will just leach away ,over the winter. The best time , IMHO, is as soon as new growth stars ,in the spring. A *small* side dressing, about 2 weeks after bloom is over will also do you some good. If you are growing Re's, they can stand a bigger "dose" at that 'post spring bloom" time.
Image
Aug 27, 2015 7:32 PM CST
Name: Leslie
Durham, NC (Zone 8a)
Garden Photography Cat Lover Irises Region: North Carolina Peonies Enjoys or suffers hot summers
Celebrating Gardening: 2015
Jen - (pardon to all of you who hear me say this often) if you have Japanese or Siberian iris do NOT use lime on them as it is poisonous to them. They like 10-10-10 and need to be fertilized again in the fall because their requirement for more water leeches the nutrients out of the soil quicker.
"The chimera is a one time happenstance event where the plant has a senior moment and forgets what it is doing." - Paul Black
Image
Aug 27, 2015 7:50 PM CST
Name: Jen Jax
Northern Kentucky (Zone 6a)
Region: Kentucky Dog Lover Irises Peonies Enjoys or suffers cold winters
Lestv said:Jen - (pardon to all of you who hear me say this often) if you have Japanese or Siberian iris do NOT use lime on them as it is poisonous to them. They like 10-10-10 and need to be fertilized again in the fall because their requirement for more water leeches the nutrients out of the soil quicker.


Thanks Leslie, I have heard that a time or too. I never put any around my Japanese iris. Now my siberians have had a dusting here and there and they still are multiplying like crazy!
Image
Aug 27, 2015 8:01 PM CST
Name: Richard
Joshua Tree (Zone 9a)
Birds Herbs Irises Ponds Plant and/or Seed Trader
The ones who use a fertilizer, do you use granules or a liquid?
Image
Aug 27, 2015 8:06 PM CST
Name: Jen Jax
Northern Kentucky (Zone 6a)
Region: Kentucky Dog Lover Irises Peonies Enjoys or suffers cold winters
Granules.
Image
Aug 27, 2015 8:17 PM CST
Name: Linnea
Southern Maine, border 5b/6a (Zone 5b)
Composter Daylilies Garden Art Irises Organic Gardener Permaculture
Plant and/or Seed Trader Winter Sowing
A bargain store had some Pennington Bulb & Bloom food. I sprinkled some around a while back. It is 10-20-10. I dunno how it will work. We will see next year. Smiling

I top dressed some new plantings with well broken down kitchen scrap compost.
Don't make fear based decisions.
Image
Aug 27, 2015 9:39 PM CST
(Zone 9b)
Region: California Garden Ideas: Level 1
I wouldn't let the new compost touch the rhizomes.

As for the fertilizer (granules), I only lightly apply it in Spring and after the majority of blooming is done. I work the fertilizer into the soil with a three prong cultivator. In Spring, I will also work some alfalfa pellets into the soil at the same time as the fert. When I plant, I work alfalfa pellets (or bone meal) and some fertilizer into the hole and mix it in.

If I don't work the alfalfa into the soil, the jackrabbits and bush bunnies will have a field day.
Image
Aug 27, 2015 10:16 PM CST
Name: Sherry Austin
Santa Cruz, CA (Zone 9a)
Birds Bulbs Region: California Dragonflies Foliage Fan Irises
Keeper of Poultry Roses Photo Contest Winner: 2015
Rob,
What is Horizons? I can only find triple 10 or triple 13... Best I can do on the low Nitrogen side is Bone Meal..
The surest sign that intelligent life exists elsewhere in the universe is that it has never tried to contact us.
Image
Aug 27, 2015 11:20 PM CST
(Zone 9b)
Region: California Garden Ideas: Level 1
http://www.horizononline.com/

If there isn't a Horizons around you, look for a product called Super Bloom. I've never used it on irises, but it has a low nitrogen and high phosphorus rating.

Only the members of the Members group may reply to this thread.
Member Login:

( No account? Join now! )

Today's site banner is by Mike and is called "'Santa Cruz' Waterlilies"

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.