Ask a Question forum→tall phlox

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New Haven, CT (zone 7)
brk203
Jun 13, 2020 9:45 AM CST
One of my garden phlox plants loses it lower leaves ---they turn yellow , curl up, and fall off-- year after year. A plant pathologist was unable to identify any insect or fungus affecting the plant. I have divided it and transplanted a portion to another pot where it did the same thing. I have tried to limit watering, tried it in different areas of the garden (it's potted) with different degrees of sun exposure. I have sprayed it with insecticidal soap and insecticides/fungicides without apparent effect. The plant still blooms but on stems that are 3/4 leaf-free. Another phlox plant, under similar conditions, does fine. Any thoughts before I rip it out?
Name: one-eye-luke US.Vet.
Texas (Zone 8a)
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oneeyeluke
Jun 14, 2020 12:01 AM CST
Deadheading the spent blossoms will help keep the leaves in production longer as well as extend the flowering time. Post a photo so we can get a look at it.
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Name: Lynda Horn
Arkansas (Zone 7b)
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gardenfish
Jun 14, 2020 1:02 AM CST
I have this problem with my garden phlox. I agree it's not a disease, I think that some varieties just do it more than others. I live with mine this way. I remove the spent leaves. I tolerate this because of its long bloom time and it's draw for butterflies. Thumbs up
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