What's your question? Ask

Knockout Rose Bushes

Q.Massive die off in Martha Gonzales [Knock out rose] that started and keeps going along the row. No insects visible.

Zone Stockdale, Texas 78160 Zone 8 | Anonymous added on July 7, 2020 | Answered

These are my sister’s and she showed me the die off. No insects visible, an organic gardener by nature and we could not come up with a reason. Roses are usually carefree plants and I could not offer any reason as to why, unless a disease which is unusual in a rose group. We have had a wet season but these have been here for more than 6-8 years.
Any help would be greatly appreciated.

A.Answers to this queston: Add Answer
Certified GKH Gardening Expert
Answered on July 9, 2020

That kind of die off signals some catastrophic event! This can happen when something gets dumped onto the soils around or near where the rosebushes are growing. Herbicide drift is also a possibility. Big dogs relieving themselves all over the bushes can cause dieback as well. Another possibility is that something is directing intense reflected sunlight onto the bushes in such a way that it is like using a magnifying glass and the sun to burn something. There also can be rodents attacking the root systems from below or even root eating insects below ground that cannot be seen.

I would start by having the soils tested to see what that shows. If it is something poured or sprayed onto the soils area, it will show up. Time to do some in-depth investigating for sure.

You might consider digging a small ditch between the dead bushes and the ones that are still okay. If you see any sort of rodent channels, get some deep reaching metal edging material and place it in the center of the ditch going down as far as possible. This will slow the rodents down while you decide how to get rid of them.


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...
Knockout Rose Bushes
Join Us - Sign up to get all the latest gardening tips!

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