By Cynthia
Michigan,
United States 
Can someone tell me if there is something I can do to stop this from growing in my garden? Also, if someone knows the name of this assumed weed, I would appreciate it. Thank you.
18 May, 2023
Answers
Thank you. I will scrap it off as I have been doing. At least I know what it is called.
19 May, 2023
Liver wort!
Never found a way of killing it and we have tons of it too. All we do is scrape it off and bin it.
You could try Moss killer on it. (Iron sulphate).
Michigan Uni say that Flumioxazin (SureGuard and Broadstar) is labeled for liverwort control. SureGuard is a water dispersible granule formulation that can be applied as directed application to the container substrate surface, avoiding ornamental crop foliage.
Would not be allowed in the UK.
18 May, 2023