Lima Beans

Lima beans (Phaseolus lunatus), also known as butter beans, are a warm-season legume from South America prized for their creamy, starchy seeds. They are botanically related to common beans but require a longer growing season and reliably warm soil to thrive. Like all lima beans, they must be thoroughly cooked before eating to neutralise naturally occurring compounds. Bush varieties stay compact while pole types climb vigorously and yield over a longer period.

Growing

Start seeds indoors 3 weeks before outdoor temperatures settle above 15 °C at night. Sow seeds 3 cm deep in individual pots to minimise root disturbance. Soil temperature for germination must be at least 18 °C — cold soil causes seed rot rather than sprouting. Transplant or direct-sow outdoors once the soil at 5 cm depth has reached 18 °C and nights remain above 15 °C. Space plants 30 cm apart in rows; provide a trellis or sturdy stake for pole varieties.

Care

Water deeply but infrequently — aim for consistent moisture at root depth without waterlogging. Avoid overhead watering once flowers appear, as wet foliage during flowering reduces pod set. Lima beans fix their own nitrogen; do not apply high-nitrogen fertiliser after establishment. Mulch around the base to retain soil moisture and suppress weeds. Pole types need support from an early stage; tie loosely and guide the leading shoot upward.

Harvest

For fresh shell beans, harvest pods when they feel plump and the outline of the seeds is clearly visible through the pod wall but the pod is still green. For dry beans, allow pods to yellow and rattle on the plant before picking. Check plants every 2–3 days during peak production, as overripe pods trigger the plant to slow production. Pull the entire pod gently to avoid snapping branches.

In the kitchen

Fresh lima beans can be added directly to soups, stews, succotash, or puréed into dips after thorough cooking. Dry lima beans should be soaked overnight and then boiled until completely tender before use. They pair well with smoked meats, tomatoes, garlic, and herbs such as thyme and bay. Always cook lima beans fully — raw or undercooked beans contain harmful compounds that are destroyed by heat.

Storing

Fresh shelled lima beans keep in the refrigerator for up to 5 days. For longer storage, blanch for 3 minutes, cool rapidly, and freeze in airtight bags for up to 12 months. Dry beans should be stored in a cool, dry, dark place in sealed containers and remain viable for 1–2 years. Cooked beans can be refrigerated for up to 4 days or frozen for 3 months.