If you want to move away from highly-toxic synthetic herbicides, Avenger AG Optima is an exceptional choice. It's a non-selective weed killer that uses d-limonene (a natural citrus oil) as its active ingredient and is effective against a broad spectrum of weeds and grasses. This spray has been developed for agricultural and non-agricultural uses and is certified organic so it can be used in organic production as well as conventional growing.

Intended for non-selective control of grasses and broadleaf weeds (both annual and perennial) in and around all crop and non-crop areas
For best results, complete coverage of target weeds is necessary
Does not translocate - it will stay where you spray it
Has a clean, fresh citrus scent
Will not stain brick, concrete or pavement
NOP (National Organic Program) compliant
For use outdoors in and around gardens, crops, orchards, vineyards and nurseries.