Anyone help me with what to apply to control thistle in mulch beds before they start poping up? Last year i had to physically remove them first from mulch bed about twenty five feet long by 12 feet wide because it was covered in em' and i wanted to save the perennials inthere along with couple shrubs and three big spruce tree's. Then on a weekly or bi-weekly pace i sprayed them so they wouldn't take over the bed again. This year i'd like to take a pro active approach and apply something after installing the new layer of mulch. Any ideas? This is a lawn i mow weekly so i am there and can keep a close eye on it for break down of chemicals, also this is a bed in Northern IL if that helps. Just a thistle problem though....Thanks!