Japanese knotweed

BARBARA ATKINSON asked 4 years ago
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.