Actually, one thing that occurs to me is that I always thought that glyphosate was best applied when the weeds are actively growing, and that they sort of need their leaves on to 'catch' the weedkiller and then transport it down to the roots, so it would be best to apply it without having lopped the weeds down to a few stalks. Although I guess with nettles at this time of the year, the stalks will be last year's growth and the leaves will be coming from the bottom. But as a general rule I think the leaves need to be there for the weedkiller to work best, unlike a ground clearing weedkiller which would go directly into the soil and remain there, effectively making the ground null and void for some time.
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Actually, one thing that occurs to me is that I always thought that glyphosate was best applied when the weeds are actively growing, and that they sort of need their leaves on to 'catch' the weedkiller and then transport it down to the roots, so it would be best to apply it without having lopped the weeds down to a few stalks. Although I guess with nettles at this time of the year, the stalks will be last year's growth and the leaves will be coming from the bottom. But as a general rule I think the leaves need to be there for the weedkiller to work best, unlike a ground clearing weedkiller which would go directly into the soil and remain there, effectively making the ground null and void for some time.