What sort of weed are you trying to kill?

It a jungle! A mix of maple saplings and other low-growing weeds. This photo is the back of the garage - the same thing around the house foundation.

There are "weed" killers, plant poisons, that will only kill off broad leafed plants and not grasses and there are plant poisons that will kill everything. Theoretically, these plant poisons are "safe" for small animals once dry. Formulations made of 2,4,D and Dicambra, are the most common.

kimmq is kimmsr