Lima Bean

Fresh lima beans (Phaseolus lunatus) are one of those vegetables where growing your own fills a genuine gap rather than just replicating what’s at the grocery store. Outside the Southeast United States, fresh shell limas are nearly impossible to find at retail - the fresh bean market collapsed as processing and freezing became the standard. Frozen limas can be found everywhere; fresh limas almost nowhere. That’s your competitive advantage.

What it actually is

Lima bean is a warm-season annual legume in the family Fabaceae, native to Central and South America. It is distinct from the common bean (Phaseolus vulgaris) - different species, different growing requirements, particularly around heat tolerance. Lima beans need more heat to set pods than common beans; they stall in cool summers and perform best where temperatures consistently hit 70-85°F during pod fill.

The distinction between baby limas and large-seeded types matters practically. Baby limas (also called sieva beans) are small-seeded varieties that mature faster, have thinner skins, and a more delicate flavor. Fordhook types are large-seeded with a starchy, buttery texture. They are not interchangeable in the kitchen - a recipe that calls for small creamy limas won’t be served well by Fordhooks, and vice versa. ‘Fordhook 242’, ‘King of the Garden’, and ‘Christmas Lima’ are heirloom large-seeded types; ‘Henderson Bush’ and ‘Jackson Wonder’ are reliable small-seeded varieties.

Bush limas reach 2 feet tall; pole limas grow 8-10 feet and need substantial support but produce over a longer season.

The ROI case

Fresh shelled lima beans retail at $3-5/lb where they are sold at all (USDA AMS Specialty Crop Market News, 2023). At farmers markets, fresh shell limas often command premium pricing simply because they are unusual. A $2.99 seed packet of large-seeded lima beans covers a 15-20 foot row. At 0.5 lb shelled beans per plant from a mature planting and typical spacing of 6 inches between plants, a 15-foot row returns 5-7 lb of shelled beans.

The math: 6 lb at $4/lb = $24 against $2.99 seed cost. That’s a strong single-season return, and saved seed from the largest plants lets you replant next year at no cost.

Growing requirements

Lima beans require soil temperatures above 65°F for reliable germination - higher than common beans. Plant 2-3 weeks after your last frost date, or when soil reaches 65°F. In cool-summer climates (zones 3-5), start indoors 2-3 weeks before transplanting, but handle roots gently - legumes dislike root disturbance.

Sow seeds 1 inch deep, 6 inches apart (bush types) or 8-12 inches apart (pole types). Germination in 7-14 days at optimal soil temperatures. Inoculate seeds with bean/legume inoculant (Rhizobium phaseoli) before planting to ensure nitrogen fixation.

Soil pH of 6.0-6.8. Average fertility is fine - overly rich nitrogen soil causes excessive foliage and delayed pod set. Avoid high-nitrogen fertilizers; apply a low-nitrogen, moderate-phosphorus starter fertilizer (0-10-10) at planting if needed.

Water consistently at 1 inch per week through vegetative growth and flowering. Reduce watering after pods form and begin to fill - excess moisture at this stage can promote pod rot and split beans. Lima beans are somewhat drought-tolerant once established, but yield drops significantly with water stress during pod fill.

Heat is the critical variable. Lima beans do not set pods well when temperatures exceed 90°F or drop below 60°F during flowering. In very hot climates, plant early to hit pod set before the peak of summer; in cool climates, choose early-maturing baby lima varieties (65 days) over Fordhooks (80-90 days).

What goes wrong

Mexican bean beetle (Epilachna varivestis) - adults and larvae skeletonize leaves. Scout for yellow egg clusters on leaf undersides and crush them. Neem oil or pyrethrin-based sprays handle heavy infestations; apply in the evening to minimize impact on pollinators.

Aphids (Aphis fabae, the black bean aphid) colonize new growth. Water blasts and insecticidal soap are effective.

Lima bean pod borer (Etiella zinckenella) is a moth larva that bores into pods and feeds on developing seeds. Damage is most common in the Southeast and Southwest. Bt (Bacillus thuringiensis var. kurstaki) applied at petal fall is an effective preventive treatment.

Root rot in cool, wet soils from Rhizoctonia or Pythium. Improve drainage and don’t plant until soil has warmed properly. Treating seed with a biological fungicide (Trichoderma species) at planting reduces early-season rot.

Pod set failure in cool summers is not a disease but a temperature response. If temperatures stay below 65°F during flowering, plants simply won’t set pods. There’s nothing to spray - you either extend the season with low tunnels or choose a faster-maturing variety next year.

Harvest and storage

For shell bean use, harvest when pods are well filled and bulging with beans, but pods are still green and slightly soft. The beans inside should be plump and fully formed. If pods begin to yellow, you’ve crossed into the dried bean stage (still usable, just different).

Shell by squeezing the pod along the seam and popping beans out. Eat fresh the same day for the best flavor and texture. Refrigerate for up to 3 days. Blanch and freeze: 3 minutes in boiling water, cool in ice water, drain, freeze in bags. Keeps 10-12 months.

For dried beans, let pods remain on the plant until fully yellow and dry. Harvest pods before they shatter; spread in a single layer in a warm, dry location for 1-2 weeks until beans rattle freely in the pod. Shell, then store in sealed jars. Dried lima beans keep 1-2 years.

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Related crops: Garden Pea, Green Bean

Related reading: Beginner Homestead Crops - legumes and other crops that double as soil builders