Daylilies forum: Heat Dormancy

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Name: Larry
Enterprise, Al. 36330 (Zone 8b)
Region: Alabama Composter Garden Photography Garden Ideas: Master Level Plant Identifier Celebrating Gardening: 2015
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Seedfork
Aug 4, 2015 3:19 PM CST
I have noticed that I have several cultivars of daylilies that seem to be suffering from what I consider to be "heat dormancy. Some of the plants have completely faded away, and come back as multiple small fans, others have just mostly disappeared leaving a few weak looking leaves, and are now developing new foliage.
Some of this I blamed on stress (setting seed pods, dividing, dry soil) but I am wondering if it might also be cultivar specific.
Anyone have any info on that?
All these photos were just taken, so this is what the plants look like right now.
Examples of some of my plants experiencing what I think is Heat Dormancy.
Thumb of 2015-08-05/Seedfork/4fe231
Thumb of 2015-08-05/Seedfork/dbad50
Thumb of 2015-08-05/Seedfork/8662da

'My Path' almost totally disappeared, but now look at the new fans developing.
Thumb of 2015-08-05/Seedfork/45b866
Example of some of my plants that did not experience Heat Dormancy
Thumb of 2015-08-05/Seedfork/f5fa4f

[Last edited by Seedfork - Aug 4, 2015 6:22 PM (+)]
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Name: Larry
Enterprise, Al. 36330 (Zone 8b)
Region: Alabama Composter Garden Photography Garden Ideas: Master Level Plant Identifier Celebrating Gardening: 2015
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Seedfork
Aug 4, 2015 6:33 PM CST
After looking at my different beds, I am almost convinced that heat dormancy is directly related to a lack of moisture. The beds with the biggest number of affected plants are far dryer than the bog bed which seems to have avoided this problem entirely except for a few of my recently acquired plants that were planted in the hot July sun with no shade. I have put shade over those and given them extra water till their roots can establish and have already seen improvement.
Name: Becky
Sebastian, Florida (Zone 10a)
Celebrating Gardening: 2015 Daylilies Hummingbirder Butterflies Seed Starter Container Gardener
Charter ATP Member I was one of the first 300 contributors to the plant database! Garden Ideas: Master Level Lover of wildlife (Black bear badge) Birds Ponds
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beckygardener
Aug 4, 2015 7:55 PM CST
Larry - I think you hit the nail on the head. When I was looking at your photos, dry soil came to mind immediately.

In my daylily beds that get constant watering and even a little shade during the day, none of the seedlings have disappeared except one. (It is completely gone!) They all have various parents, so the likelihood of at least some of them going into summer dormancy should be in the 70+ seedlings, but none have, so .... water is key to a happily growing plant.
What lies behind us and what lies before us are tiny matters, compared to what lies within us.
Garden Rooms and Becky's Budget Garden
Name: Cynthia (Cindy)
Melvindale, Mi (Zone 5b)
Hybridizer Irises Butterflies Charter ATP Member Birds Cat Lover
Region: United States of America Region: Michigan Vegetable Grower Daylilies Hummingbirder Heucheras
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Hemlady
Aug 5, 2015 6:52 AM CST
I would agree also about lack of moisture. Before our rain storm last Sunday, my daylilies were showing a lot of leaves going dormant. Since the rain they look much better. We hadn't had any rain in over 10 days and it showed.
Lighthouse Gardens
Coatesville IN (Zone 5b)
Daylilies Hummingbirder Lilies Region: Indiana Dog Lover Echinacea
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Claudia
Aug 5, 2015 7:05 AM CST
Some of mine are doing the same. We have no rain last week or this week. May get some tomorrow. This is the longest we have been without rain this spring/summer!

I do have one daylily that by the time it is finished blooming the foliage is all down & that is FLASHER. It does it every year so seems to be in its genetics.
Weeds are flowers too, once you get to know them. ~Eeyore
Name: Becky
Sebastian, Florida (Zone 10a)
Celebrating Gardening: 2015 Daylilies Hummingbirder Butterflies Seed Starter Container Gardener
Charter ATP Member I was one of the first 300 contributors to the plant database! Garden Ideas: Master Level Lover of wildlife (Black bear badge) Birds Ponds
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beckygardener
Aug 5, 2015 7:25 AM CST
Claudia - Sounds like "Flasher" does go into summer dormancy regardless of water or other conditions. A true dormant of heat perhaps?
What lies behind us and what lies before us are tiny matters, compared to what lies within us.
Garden Rooms and Becky's Budget Garden
Coatesville IN (Zone 5b)
Daylilies Hummingbirder Lilies Region: Indiana Dog Lover Echinacea
Butterflies Birds Lover of wildlife (Raccoon badge) Garden Photography Garden Ideas: Level 2 Celebrating Gardening: 2015
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Claudia
Aug 5, 2015 11:39 AM CST
I do not even pretend to understand all this but it would appear it does.
Weeds are flowers too, once you get to know them. ~Eeyore

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