In article , Franz Heymann
writes

Organic gardening is not the be-all and end-all of gardening, and
clover is not the only plant which is a pest under certain
circumstances. Alchemilla mollis is a pest in my garden, as is moss.
There are gardens in which Japanese Knotweed is a pest.
Please read my other posts on the definition of the term "pesticide".

I already have.
--
Alan & Joan Gould - North Lincs.