We had a cottonwood tree removed last fall and the stump was ground up under the dirt line. NOW our yard is full of suckers. Tried Sucker stopper, did not work. The dirt and lawn is now actually SPONGY and cracking around where the tree stump was and the suckers are EVERYWHERE! I have been digging them up with a dandelion digger, but they are getting worse. Is there a chemical that we can pour into these cracks to kill the roots? Any advice would be greatly appreciated. I have been told to try Super Kill’s All on the suckers and in the cracks! What do you think?
Certified GKH Gardening Expert
Undiluted Round Up will help kill the roots. You will need to wound the roots (normally, people cut the suckers down and use those wounds) and then paint the undiluted Round Up on the wounds. The bigger or more wounds you paint, the better.The roots will suck the Round Up in and it will kill them. You may have to repeat the process a few times to fully kill the roots if the root system is still strong.