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Jun 4, 2018 12:26 PM CST
Thread OP
Name: Judy
Aurora, Illinois (Zone 5b)
Several of my daylilies are developing brown leaves. I looked online and it looks similar to leaf streak. But what I read is that leaf streak develops later in the summer. I am near Chicago.

Whatever it is, what should I do for the plants?

Thank you
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Jun 4, 2018 1:33 PM CST
Name: Sue
Ontario, Canada (Zone 4b)
Annuals Native Plants and Wildflowers Keeps Horses Dog Lover Daylilies Region: Canadian
Butterflies Birds Enjoys or suffers cold winters Garden Sages Plant Identifier
It doesn't look quite like leaf streak although it could be. Have those daylilies been kept well-watered or could the soil have dried out significantly?
Jun 4, 2018 3:27 PM CST
Name: Larry
Enterprise, Al. 36330 (Zone 8b)
Composter Daylilies Garden Photography Million Pollinator Garden Challenge Garden Ideas: Master Level Plant Identifier
Celebrating Gardening: 2015 Region: Alabama
I would start removing all those leaves that look like it might be leaf streak. Water them well, maybe give them a shot of fertilizer to encourage new leaf growth.
Jun 4, 2018 8:08 PM CST
Name: Tim
West Chicago, IL (Zone 5a)
Daylilies Native Plants and Wildflowers Vegetable Grower
Hi Judy,

I'm not that far from you, and I wanted to show you this:

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It looks almost exactly like yours!

I have just this one pocket of 5 plants that looks like your plants. It's hard to image that we've dried out our plants after having the wettest May in our history, but I think that's what we're dealing with. Either that, or we're having some unique issue driven by the fact that we were really, really hot, then we'd get 2 or 3 inches of rain, then it was back to really, really hot, then it was 3 more inches of rain. Could be they are just stressed by these crazy weather swings.

The spot I have the problem is in the fullest sun. These guys never get a break and that streak of 90 degree days maybe fried some of our foliage. If yours also get a lot of sun, maybe we have the same thing.

I think Sue is right, and I also followed Larry's advice. I did take it easy on the water, though, since we just got 3.25 inches in West Chicago last Wednesday. I trimmed off the dried bits, watered a little, and added a light amount of 10-10-10. I was thinking if they are just stressed by the weather, I didn't want to over-do anything. I don't think this is fungus related like leaf streak, but I had some fungicide in the garage, so I gave it a little squirt just in case.

I guess I'll know in a month if that was the right thing to do. Here's how it looks cleaned up.

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Jun 4, 2018 8:19 PM CST
Thread OP
Name: Judy
Aurora, Illinois (Zone 5b)
Thanks all.

Lyshack, I wondered about the intense heat, too. My plants are next to others that look OK. I will trim off the brown and try some fertilizer. Time will tell, I guess.
Jun 4, 2018 10:55 PM CST
Name: Diana
Lincoln, NE (Zone 5b)
Daylilies Region: Nebraska Organic Gardener Dog Lover Bookworm
@dewsky620 and @Lyshack
The weather here in Nebraska has been like that too- hot, then rainy, hot, then rainy. And I know some of mine dried out a bit in the field beds. They ended up with some brown leaf tips...
The flowers in the raised beds have better soil and they didn't dry out as much- fewer brown parts by far. Not a bad idea to follow Larry's advice : )
Bravery is not being unafraid. Bravery is being afraid and living life anyways.
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