On 11/07/2016 23:10, Stewart Robert Hinsley wrote:
On 09/07/2016 13:38, Janet wrote:
In article ,
says...



It will take a couple of years of treatment to fully eradicate though so
don't expect to get it all in one go.

I daily drove past a 'colony' and watched as it was treated for,
aprox, 3
years before it was completely eliminated. Its tough stuff!

Our local council has been spraying several local colonies of JKW for
several yesrs. You can see the deadly effect every time they treat it,
but the next year it rises from the grave again.

AFAIK, in the UK climate JKW does not propagate by seed; so a
colony's survival after weedkilling is not down to seed germination; it
reflects the depth, extent and vigour of its root systems.

My understanding is that the reason for a lack of seed propagation is
not the climate but that the plants are (nearly?) all female, so they
never (hardly ever) get pollinated. You do get hybrids with Russian vine
and giant knotweed.

But it's remarkably widespread for a plant that doesn't propagate by seed.

Janet



Janet



It is remarkable how small a piece will regrow, even the mush on a
strimmer will produce viable plants if put in a nice spot!

It has become a much bigger problem down here once they started getting
excited about it and lenders not giving mortgages etc, people panic, try
and dig it up and fly tip it.

Weed killer and persistence is the way to go

--
Charlie Pridham, Gardening in Cornwall
www.roselandhouse.co.uk
National collections of Clematis viticella & Lapageria rosea