but it wont actually kill any weeds itll just be uncomfortable to them for a week, youd have to keep spraying it on, probaly every month or so for it to be effective. you need some sodium chlorate. that will kill everything and it lingers, 6 months i think.but make sure you line the bottom of your beds, so your crops roots cant reach it.you might be better building your beds, then sodium chlorate for the paths etc..