Clover needs full sun. You may get away with 1/2 sun but the growth won' t be as good. It' s roots go down 2-3' . Alfalfa' s roots can go down deeper (6-8' ) if the soil isn' t hard packed. You should be OK planting clover if the water table is 4' down unless the area floods badly during the wettest part of the year.

Dan O.