Spikes of white flowers up to 6 feet in height top out this hardy perennial that requires full sun and moist but well drained soils. New plantings should have the bloom spikes staked the first year to avoid toppling. Avoid windy planting sites and plant on a slight mound to help prevent crown rot. A number of compounds in the flowers, leaves and seeds are toxic and should not be ingested - this also deters herbivores from eating the plant.