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See more questions on Weeds

Japanese knotweed

your advice was to cut the stem ?? above ground, My Q1 is how low? also, to put teaspoon undiluted Roundup into each stem. Q2 should i spray the ground around the plant? i never use chemicals in my garden so i am wary of using some now. i'm unable to do this job myself so i need to give precise instructions. BOTANICAL TRYER, TERENURE, Co Dublin Posted: 23/08/2017

Cut down to 20 to 30cm.The chemical glyphosate only works on green tissue, not on the soil.

 

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