Knowledgebase

preventing black locust suckers #753769

Asked June 03, 2021, 1:36 PM EDT

We have several large black locust trees at the side of our yard, and we have suckers growing in many places. When I cut them back they just regrow. Is there anything I can put on the stems after I've cut them back to keep them from re-growing?

Baltimore City County Maryland

Expert Response

Hi,

The black locust tree (robina pseudoacacia) will make you crazy!  I have several in the woods behind our house, so I understand your frustration.  

I have found the most effective method of dealing with the suckers is to cut them off about 1-2 inches above the ground and then apply some glyphosate to the stalk.  Glyphosate is a broad spectrum herbicide found in several commercial weed killers, e.g. Round-Up. Make sure you wear gloves.

Thanks for contacting us,

Judy

Answered by the Home and Garden Information Center (HGIC), University of Maryland Extension. For timely gardening information and tips, subscribe to our Maryland Grows blog and quarterly newsletter. Follow us on Facebook, Instagram, and YouTube. Replied June 04, 2021, 3:10 PM EDT
I have some Roundup spray, but it's at least five years old. Would it still be good? I quit using it because a family with small kids moved in downstairs.

On Friday, June 4, 2021, 3:10:31 PM EDT, Ask Extension <<personal data hidden>> wrote:


The Question Asker Replied June 04, 2021, 3:24 PM EDT

Check the container for an expiration date, I think it is good for 3-5 years once opened. 

Judy 

Answered by the Home and Garden Information Center (HGIC), University of Maryland Extension. For timely gardening information and tips, subscribe to our Maryland Grows blog and quarterly newsletter. Follow us on Facebook, Instagram, and YouTube. Replied June 04, 2021, 3:35 PM EDT
Thanks!

On Friday, June 4, 2021, 3:35:08 PM EDT, Ask Extension <<personal data hidden>> wrote:


The Question Asker Replied June 04, 2021, 3:42 PM EDT

Loading ...