#Knot Weed
4 messages in this thread
I get Japanese knot weed here, which starts in spring and ruins my lawn.
Any ideas on how to stop it? One problem is that the next door gardens have
it, but don't try hard to stop it.
John.
Hi John,
With a neighbor that doesn't attempt to curb the weeds, you do have a
problem. The Japanese knotweed spreads rapidly by seed and rhizomes. You
might try using pre-emergent weed control this spring and never let the
weeds go to seed. Check with a local nursery to see what products they
have available.
Alison
John, could you describe Japanese knot weed a bit? Reproduce by roots or
seed? broad leafed or grassy form? Annual or perennial?
Knot weed is probably the most persistent and most difficult to kill off of
all the weeds we have in the UK – it spreads vegetatively and according to
rumour has been known to cross under motorways. You should keep treating
with a heavy duty systemic weed-killer such as SBK (UK brand) by painting
all the visible leaves as they emerge – which they will start doing in a
month or so, I guess, depending on where you live. You won't get quick
results but you will eventually kill the infestation off. Don't forget to
check if your neighbours have the infestation as well and get their
co-operation. Do not, no matter how organically inclined you are, think you
can get rid of knot weed by digging it out – the roots go down a very long
way and re-generation is possible from incredibly small fragments. There is
one other way of eliminating the problem – move!
Sorry not to have better news – good luck