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tickseed coreopsis won't bloom #873605

Asked June 18, 2024, 12:28 PM EDT

I have a wildly spreading bunch of seemingly healthy tickseed coreopsis. The plants look really good but this is the second year that it is not blooming. I have had it 10 years and most years it has done well.

Hennepin County Minnesota

Expert Response

Amount of sunshine is a key factor.  They must have 6-8+ hours of sunlight.  With the crowding they may not get that.  I would thin them out.  You could also get a soil sample to determine if your soil is lacking anything.
https://soiltest.cfans.umn.edu/
MaryKay, Master Gardener, Tree Care Advisor Replied June 19, 2024, 6:02 PM EDT
Is it possible they have a disease?  Someone suggested Aster Yellows but the plant looks good except for the fact that the buds never open.  

Thanks for your help!
Susan

On Wed, Jun 19, 2024 at 5:02 PM Ask Extension <<personal data hidden>> wrote:
The Question Asker Replied June 20, 2024, 1:54 PM EDT
Deformed flowers are a more common sign.  And there are usually other problems as well.  See the following website for more detailed information.
https://extension.umn.edu/plant-diseases/aster-yellows
MaryKay, Master Gardener, Tree Care Advisor Replied June 20, 2024, 3:02 PM EDT

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