Jap.knotweed

[Trailoftears]

I notice with dealing with Himalayan Balsam over the same riverside areas over several years-both hand-pulling the bigger individuals and sometimes b/cutting both large and small plants that not only can it flower at the usual heights,say 2-4' high.But over time it starts to flower at really low heights-4-6" hiding in coarse riverside grass.So really hard to track given its flowering under the grass population.N.R.W. did make an attempt to control it in my area a few years ago.Suffice to say,that didnt go well.I have visions of well-meaning volunteers sobbing amongst thickets of gorse and wanting to go home!

[Muddy42]

3 hours ago, Trailoftears said:

I notice with dealing with Himalayan Balsam over the same riverside areas over several years-both hand-pulling the bigger individuals and sometimes b/cutting both large and small plants that not only can it flower at the usual heights,say 2-4' high.But over time it starts to flower at really low heights-4-6" hiding in coarse riverside grass.So really hard to track given its flowering under the grass population.N.R.W. did make an attempt to control it in my area a few years ago.Suffice to say,that didnt go well.I have visions of well-meaning volunteers sobbing amongst thickets of gorse and wanting to go home!

interesting, i’ve not seen HB exhibit that kind of behaviour yet, but then I have not been cutting just pulling up. I find it best to tackle large areas early on before they flower and the cover gets really think. You soon develop a hawk eye for identifying the leaves!

[Trailoftears]

Its in its own way,q.fascinating,you cant help admiring how these hugely successful plants adapt and evolve to what ever the environment and Human intervention throws at them.I've walked thru a low lying woodland area next to a ditch close to riversides and made a mental note to deal with them asp given the population is heavy/2' high.Next time the whole area is full of river debris after a sudden spate and their population is trashed/flattened.A week on,they slowly struggle back up/re-generate nodally.

[Brushcutter]

On 25/06/2023 at 20:26, Trailoftears said:

When you say stem inject it,do you mean every single stem in a large stand of say 60 stems?At what height do you inject each stem-down close to the rhizome mass say?It seems to have much the same internal discrete nodal system as bamboo.Do these 'boxed off' nodal areas inhibit internal travel at all?🤔

 

Any stem over 8mm between the 2nd and 3rd node. 1.5ml of neat product per stem. 

 

There is also a stem filling technique. Cut it off quiet high up and fill it up wirh diluted gylphosate within 15mins  I have never done that technique.