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Post by grindle on Oct 24, 2011 7:19:35 GMT
I remember AT talking about weeds way back, and his remedy for JK in a garden was to move ;D It looks like they didn't notice soon enough though
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Post by floydie on Oct 24, 2011 18:16:07 GMT
Next door has it, its been treated a fair few times this year , I hope it never pops up this side of the fence! Its also growing (or was) behind her fence on the open land behind us.
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Post by floydie on Oct 24, 2011 18:37:11 GMT
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Post by Louise on Oct 24, 2011 19:04:29 GMT
What I meant was how does it spread from one place to another, it's dotted about all over the Countryside so either someone is planting it or something is spreading it's seed. I've just read that it spreads itself by 'vegetative regeneration', so presumably not seed then - it's like that b****y A canthus that was growing here in the front garden, took best part of 3 years to shift the stuff
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Post by peony on Oct 24, 2011 19:11:05 GMT
What I meant was how does it spread from one place to another, it's dotted about all over the Countryside so either someone is planting it or something is spreading it's seed. I've just read that it spreads itself by 'vegetative regeneration', so presumably not seed then - it's like that b****y A canthus that was growing here in the front garden, took best part of 3 years to shift the stuff Sounds like ground elder, if even the tiniest piece of root is left in the soil it regrows, as I know only too well
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Post by wildlifefriendly on Oct 24, 2011 19:15:52 GMT
It is a shame it is so invasive, it grows beside the river where I walk the dog, it is a beautiful plant.
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Post by merlin on Oct 24, 2011 19:19:13 GMT
Japanese knotweed can produce seeds, but it is extremely rare for these seeds to germinate. OK but if it doesn't spread by seed, how does it spread spread so far?
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Post by Lou78W on Oct 24, 2011 19:21:04 GMT
Its roots Merlin......see Louise's post above ;D......just like bindweed, ground elder, couch grass etc.......
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Post by merlin on Oct 24, 2011 19:26:50 GMT
So, if two plants are a few miles apart, do the roots reach between them?
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Post by peony on Oct 24, 2011 19:31:30 GMT
Japanese knotweed can produce seeds, but it is extremely rare for these seeds to germinate. OK but if it doesn't spread by seed, how does it spread spread so far? WF mentions in her post that it grows by a river, if just a tiny piece of root got into the river and was washed downstream and into the riverbank it could then grow perhaps miles away from the original plant.
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Post by merlin on Oct 24, 2011 20:00:56 GMT
Japanese knotweed can produce seeds, but it is extremely rare for these seeds to germinate. OK but if it doesn't spread by seed, how does it spread spread so far? WF mentions in her post that it grows by a river, if just a tiny piece of root got into the river and was washed downstream and into the riverbank it could then grow perhaps miles away from the original plant. Now thats what I call scary
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Post by Louise on Oct 25, 2011 5:59:59 GMT
That's the very essence of the problem - because it is so scary and rampant.
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Post by wildlifefriendly on Oct 25, 2011 6:39:24 GMT
There are lots of patches of it all along the river bank. Roots get washed out when the river floods and are carried down stream. Year by year I have noticed new clumps appearing.
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Post by peony on Oct 25, 2011 9:04:28 GMT
There is another very invasive riverbank plant I read about in the RHS magazine, its a relative of impatiens (I think it was called Balsam), and it has seed pods which when they 'pop' throw seeds in all directions and those that go into the river float down and grow new plants elsewhere.
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Post by floydie on Oct 25, 2011 9:08:07 GMT
There is another very invasive riverbank plant I read about in the RHS magazine, its a relative of impatiens (I think it was called Balsam), and it has seed pods which when they 'pop' throw seeds in all directions and those that go into the river float down and grow new plants elsewhere. Its very pretty too, but spreads like mad, (If I'm thinking of the same plant).
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