Flowers provide food for bees in the form of nectar and pollen. Thus flowers are critical to their survival. However, not all flowers produce pollen and nectar. The best way to find flowers that are attractive to bees is to go to a garden center on a sunny day. Bees will point the way to attractive flowers, the ones that will provide them pollen or nectar or both. The ultimate for bees is the have a garden that has continuous bloom from spring through the summer.
