Paraquat has arsenic in it and it can sterilize the soil it is used
for clearing lanes and sidewalks.

Derryl Killan
Calgary, Alberta, Canada.


Most weedkillers are ineffective in the kind of weather you have in the
UK at the moment. they all need active growth of the weeds to work.
Glyphosphate will kill down to the roots, but wiill only work very
slowly, and lose its effectiveness in the cold weather. Weedkiler
containers usually state to use when weeds are in active growth, and
usually state in Spring and not if it is likely to rain as they only
become effective once they ahve been absorbed by the weed. The
advantage of glyphosphate is the once the weeds have been killed it is
safe to plant seeds and plants as it is not retained in an active form
in the soil.