These flowers are known for heavy production of yellow, white or pink flowers that open in the morning or evening. Very tolerant of poor, even rocky soils as long as they are well-drained. Grows in full sun and blooms from June-August on once-a-week watering. This plant tends to sow itself about the yard when conditions are right. Not bothered by rabbits, squirrels nor deer.
O. biennis — 3-5 ft. tall by 2 ft. wide;
yellow flowers, fragrant in the evening
from June-September
O. caespitosa — 8 in. tall by 8 in. wide;
white flowers, fragrant in the evening in July
O. fructicosa (Sundrops) — 1-3 ft. tall by 1 ft. wide; yellow flowers, fragrant in the morning from May-July; many hybrids
O. pallida — 18 in. tall by 12 in. wide;
white flowers, fragrant in the evening
from June-September
O. speciosa (Showy Primrose) — 1 ft. tall by 1 ft. wide; white or pink flowers, fragrant in the morning from June-September