Geek Bar Flavors All Flavors Chart & Ranked You've heard of pesticides, but what about herbicides? Herbicides are a type of pesticide designed to kill or manage weeds, but they don't all work the same way or show up in Chinese Evergreen (Aglaonema): All You Need To Know Bicarb can be used as a weed suppressant on most driveways and hard standing so when I had a message from Linda on how to apply on gravel it got me thinking.