Crown vetch prefers sunny, open areas Drought tolerant but also withstands heavy precipitation, This legume should be planted for erosion control in certain hard-to-reach areas Clay Soil, Sandy Soil, Loamy Soil, Drought/Dry Soil Crown Vetch produces lovely white and purple blooms. This legume is extremely easy to grow and will thrive in most soil conditions. It will take over most areas where it is planted, even overpowering weeds. Plant Crown Vetch in hard to reach places where you would like erosion control and some pretty color that does not need to be maintained.