Leavenworth's Coreopsis Coreopsis leavenworthii is a perennial that is highly adaptive to wet areas and also excellent for hot dry sites with poor soil. Planting method suggests to thin turf, broadcast seeds over area, rake or drag to make contact with soil. Water occasionally until sprouted. Net weight: 15mg. Packet will seed 100 sq ft. Sow in fall for spring blooms. North Florida ecotype.