You probably make a clear distinction between the types of flowers in your garden. There are those you've planted and nurtured, and there are those that are in fact weeds which happen to produce flowers. To you, there's a clear difference. Insect pollinators such as bees may be less discerning. How can you eliminate these weeds without eliminating bees? Bees and Herbicides Herbicides that are lethal to bees can be dangerously effective, since studies have found that some herbicides actively attract bees, who are then poisoned.