What's your question? Ask

Black Eyed Susans

Q.How Should I Treat Black Spot on Rudbeckia

connie knaggs added on June 22, 2011 | Answered

Lower leaves of Rudbeckia (black eyed Susan’s) have black spots on them. We have had unusual amounts of rain this spring. Could this be part of the problem?

A.Answers to this queston: Add Answer
Certified GKH Gardening Expert
Answered on June 26, 2011

Yes, the additional rain is the cause. These plants tend to grow close together, which means there is not much air flow to begin with. The additional moisture from the rain makes them far more susceptible to fungus.

A standard fungicide sprayed on the plants will help clear up the problem. You may want to consider dividing some of the plants if they are growing close together.

Was this answer useful?

Log in or sign up to help answer this question.

Did you find this helpful? Share it with your friends!

You must be logged into your account to answer a question.

If you don't have an account sign up for an account now.

Looking for more?
here are more questions about...
Black Eyed Susans
Join Us - Sign up to get all the latest gardening tips!

Do you know a lot about gardening?
Become a GKH Gardening Expert