What's your question? Ask

Hyacinth Plant

Q.Knockout rose bushes

Zone Southeastern Kansas | karmor98 added on July 8, 2015 | Answered

Put in some Knockout rose bushes last year. They did great. Husband trimmed them back this spring and they seemed slow to grow, but have come back okay. My problem is about a month ago I noticed RED spots on the leaves. On top of the leaves, not underneath. Then noticed they weren’t blooming as much as they did last year and when they do bloom, the flowers are very small, like their growth has been severely stunted and the color is no longer a nice red but more of an ugly pink. So now the red spots are gone but now have black spots and the flowers are few and far between with tiny blooms. What happened?? Thanks!

A.Answers to this queston: Add Answer
Answered on July 10, 2015

It sounds like a possible fungus attack. Also in the hotter months of the year the color is not as vibrant as in the early spring and then again later in the year when temps cool down. Spray all of the roses with a good fungicide such as Green Cure or if you cannot find the Green Cure locally or on-line try Immunox as directed on the label. There is also a product by Bayer called Tree and Shrub granules. Giving all the rosebushes some of that product will typically handle the problem as well.

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...
Hyacinth Plant
Join Us - Sign up to get all the latest gardening tips!

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