Mulch Problems
Q.

Would Dark Mulch Have Walnuts Inhibiting Growth?

mary t added on May 1, 2012 | Answered

All of the plants in all the beds did not grow as they did in past years. Someone pointed out that walnut stunts the growth. Would this be the case of the dark black mulch? I used dark black mulch last year and I had a very poor showing of flowers. The retailer claimed there were NO walnuts in the mulch.

A.
A.Answers to this queston: Add Answer
Heather
Certified GKH Gardening Expert
Answered on May 3, 2011

It would not have contained black walnut. But, if you use mulch every year, the soil may be depleted of nitrogen, which would stunt plant growth. You should have the soil tested to see if this has happened.

Another possibility is that the mulch was dyed, which has its own issues. This article has more on that:
https://www.gardeningknowhow.com/garden-how-to/mulch/dyed-mulch-in-gardens.htm

00
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...
Mulch Problems
Join Us - Sign up to get all the latest gardening tips!

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

Learn More