Papilionaceae (known as Papilionoideae in some classification systems) is the scientific name of a subfamily of plants in the legume family, with flowers that resemble butterflies. Lablab is a genus (Lablab purpureus) within this subfamily and is commonly known as the hyacinth bean plant. This herbaceous perennial vine is heavy in maturity and needs a strong support structure on which to climb. Lablab is cold-intolerant and thrives in USDA Hardiness Zones 10 and 11. Start the seeds six to eight weeks prior to the last frost.
Place the lablab seeds in a shallow bowl and pour warm water over them. Allow them to soak for two hours.
Fill the planting pot to within 1/4 inch of the rim with moist potting soil.
Place two lablab seeds on the surface of the soil, 1 inch apart, and cover them with 1/2 inch of soil. If planting more than two seeds use additional pots, with two seeds per pot.
Water the soil carefully so as not to disturb the seeds. When the pot has drained completely, place it in an area that receives full sun for at least six hours per day. Keep the soil moist at all times. The lablab seeds should germinate within two to three weeks.