Ask a Question forum: Cosmos plant

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Name: Erika
San Diego (Zone 1a)
Mar 13, 2016 12:55 PM CST
Hello everyone, I am a new to gardening. I planted a few cosmos and one of them looks like it might canker disease or it could be something else. I've read up to terminate the plant ASAP. But the damage is only on the flower not on the stems nor at the root. Any suggestions as to what I can do?I have 3 Cosmo plant planted on the same pot. Should I also remove all of them if the flower is infected?
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Name: Carole
Clarksville, TN (Zone 6b)
Charter ATP Member Garden Sages Plant Identifier I was one of the first 300 contributors to the plant database! I helped plan and beta test the plant database. I helped beta test the Garden Planting Calendar
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Mar 13, 2016 2:53 PM CST
Hi Erika. Canker can attack your Cosmos once the flowers have bloomed, but it causes dark brown scab-like formations on the stems rather than on the blooms.
The best and most beautiful things in the world cannot be seen or even touched -- they must be felt with the heart. ~ Helen Keller
central Illinois
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Mar 13, 2016 2:55 PM CST
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Name: Debra
Garland, TX (NE Dallas suburb) (Zone 8a)
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Mar 13, 2016 3:02 PM CST
Welcome, Erika. Smiling
Welcome! Welcome! Welcome!

I have seen something similar on flowers during periods of drought, but don't know what is causing that on your Cosmos.
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Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
Mar 13, 2016 7:11 PM CST
If it's only on the flowers, it's probably sunburn or windburn. Don't worry about it.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

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