Hyacinth bean has large green leaves and upward curving flower wands of pure white followed by flat pods. They attract butterflies and do well in the heat and humidity of full summer, starting their bloom in midsummer and continuing until frost. The muscular vines twine up stalwart supports, such as an arbor or teepee, and if they top the structure, a quick pruning of that topmost growth will contain it somewhat. Dolichos prefer humus-rich, moist soils and additional organic flower fertilizer as they set buds. Caution: Poisonous mature beans. Beans edible only when cooked.