Q: I wrote to you last year about Japanese Knotweed in my garden. I used Round-up tree and stump liquid which seemed to kill off the main big root and other smaller roots which I dug up. Two small shoots of knotweed are appearing again. Should I treat straight away or wait till they get bigger. Your advice in this matter would be appreciated.
A: I most likely warned you that Japanese Knotweed is difficult to eradicate in one year. You are better off not digging roots up as if any broken pieces are left they will regrow. Await all new shoots to achieve approximately nine inches and then use the same Round-up product as before. You will win one day!!