The Roundup Fast Action does contain glyphosate - however I think the blurb is misleading - it says you see results in 1-2 days - you may see some browning/yellowing of the leaves, but the plants will not be dead for a couple of weeks. You have to leave them and wait until they're totally dead before you pull/dig them up.
I think I'm going to take a trip out to b and q and see what's about with the highest glyphosate content. Then hopefully it'll just do the job. I like the pump and spray roundup product it's quick, easy to use.
The roundup product says it degrades to allow planting but can anyone advise how long to leave it for.
I don't want to plant all my dahlias out and then find them dead.
You're safe on the replanting with glyphosate. Use it as directed, not extra strong. Extra strong might kill off the top too quickly for it to have been absorbed by the roots
If you want strong Glyphosate get it at an agricultural store. They may not sell it to you so get a friendly person who they will sell it to, to buy it for you.
And do not buy it ready-diluted at any store if you can help it - it will be very expensive.
Plants may take up to a month to die completely but the poison is inactive as soon as it hits the ground.
But Nutcutlet is right - if you mix it stronger than the label suggests for the sort of weed you're trying to kill, it will burn the tops before it gets absorbed into the roots. The weeds will appear to die but will re-grow. Patience, and reading the instructions on the bottle, are really important.
Since 2019 I've lived in east Clare, in the west of Ireland.
I've not ever tried or seen this method, my assumption is the weed killer is injected into the stem?
I think for simplicity I will see if today's efforts result in the hogweed dying. But out of interest where would the equipment for injecting be found? I'm guessing it's not a b and q on the shelf jobby.
Edd, I know injecting glyphosate is the way to deal with Japanese Knotweed - but we're talking here about simple Common Hogweed here - it's not even running to flower yet so no hollow stems to inject but lots of fresh leaf area to spray - spraying the leaves the orthodox way will do the job perfectly well.
We dealt successfully with hogweed many many times on the farm and smallholding.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
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The Roundup Fast Action does contain glyphosate - however I think the blurb is misleading - it says you see results in 1-2 days - you may see some browning/yellowing of the leaves, but the plants will not be dead for a couple of weeks. You have to leave them and wait until they're totally dead before you pull/dig them up.
http://www.homebase.co.uk/en/homebaseuk/roundup-fast-action-pump-n-go-weed-killer---5l-250046
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
The roundup product says it degrades to allow planting but can anyone advise how long to leave it for.
I don't want to plant all my dahlias out and then find them dead.
Thanks
You're safe on the replanting with glyphosate. Use it as directed, not extra strong. Extra strong might kill off the top too quickly for it to have been absorbed by the roots
In the sticks near Peterborough
Check the instructions on the pack - different strength formulations vary.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
And do not buy it ready-diluted at any store if you can help it - it will be very expensive.
Plants may take up to a month to die completely but the poison is inactive as soon as it hits the ground.
But Nutcutlet is right - if you mix it stronger than the label suggests for the sort of weed you're trying to kill, it will burn the tops before it gets absorbed into the roots. The weeds will appear to die but will re-grow. Patience, and reading the instructions on the bottle, are really important.
I think for simplicity I will see if today's efforts result in the hogweed dying. But out of interest where would the equipment for injecting be found? I'm guessing it's not a b and q on the shelf jobby.
Edd, I know injecting glyphosate is the way to deal with Japanese Knotweed - but we're talking here about simple Common Hogweed here - it's not even running to flower yet so no hollow stems to inject but lots of fresh leaf area to spray - spraying the leaves the orthodox way will do the job perfectly well.
We dealt successfully with hogweed many many times on the farm and smallholding.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.