Clover:

Clover in your lawn is a very good food source for the bees. Clover roots have nodules and colonies of symbiotic bacteria, which release more nitrogen into the soil than the plant uptakes, making it a very beneficial soil nitrogen fixer! Clover is also well appreciated for it's sweet scent! Although non-native, clover was introduced to United States in the early colonial days. Clover is native to the Mediterranean. Fun fact, before around the early 1950's, clover seed was common to find up to 5% clover seed in bags lawn seed due to it's beneficial properties. That stopped when lobbyist in the chemical companies waged aggressive campaigns against clover and deemed it to be what we now call a weed. Another major benefit of clover, is it's ability to outcompete many broadleaf weeds as a groundcover with a high tolerance to foot traffic.