🫘 When to Plant Lima Beans

Lima beans are a warm-season annual that thrives in the kind of heat other vegetables merely tolerate. They deliver a buttery, creamy texture that no canned version comes close to, and they keep producing through the hottest stretch of summer when many spring crops have already wound down. The one condition they insist on: soil at 65°F before you sow a single seed.

Recommended Varieties

Lima beans split into bush and pole types, and more than with snap beans, the right choice hinges on season length and night temperatures. Limas thrive in sustained heat but dislike cool nights; the large-seeded types in particular drop their flowers when nights turn cold.

Bush types (about 2 ft tall, no trellis needed, and they bear earlier):

• Henderson’s Bush: small “baby” limas in 60-75 days; drought-resistant and dependable, the safest pick where the season is short or nights stay cool
• Baby Fordhook: buttery baby limas, about 75 days
• Jackson Wonder: a heat- and drought-tolerant heirloom baby lima
• Fordhook 242: large, meaty beans on a bush plant; notably heat-tolerant, and it keeps setting pods through hot summers

Pole types (10-12 ft, need a sturdy trellis, and they yield heavily over a long season):

• King of the Garden: a large-seeded climber with heavy yields, about 85-90 days
• Christmas (Speckled Calico): large speckled beans with rich flavor; full-season variety

Matching variety to your zone: Short-season or cool-night zones (5-6) should lean on the small-seeded baby bush limas. Henderson’s Bush, Baby Fordhook, and Jackson Wonder mature fastest (60-75 days) and shrug off cool nights better than the big-seeded Fordhook and the pole types. Long, hot zones (7-11) get the full range: heat-tolerant Fordhook 242 for big bush beans, or a pole type for weeks of continuous harvest. Because limas need a long warm run, most gardens sow once; only the longest-season zones (9-11) have room for a second bush sowing after the first comes out.

Spacing, Sun, and Soil

Lima beans want full sun, at least 6 hours and preferably 8. Short a few hours of sun and you get lush vines with thin harvests.

Spacing depends on plant type. Bush varieties do well at 4-6 inches apart in rows spaced 24-30 inches apart. Pole types need 6-9 inches between plants with rows 30-36 inches apart. Give pole types a sturdy support at planting: a 10-foot trellis, a tripod of heavy stakes, or a strong fence. Vines get heavy when loaded with pods and will pull down a flimsy structure mid-season.

Soil should drain freely. Lima beans tolerate average garden soil at a pH of 6.0-7.0 but struggle in heavy clay or anywhere water pools after rain. Work compost into the bed, but hold back on nitrogen fertilizer. As legumes, limas fix their own nitrogen from the air through root nodules, and excess added nitrogen pushes leafy growth at the expense of pods. In a bed that hasn’t grown legumes before, coat seeds with a rhizobium inoculant (available from most seed companies) right before planting; it gives nitrogen fixation a head start.

Soil temperature is non-negotiable. The direct-sow dates in the calendar above are set approximately two weeks after last frost to allow the ground to warm. If your spring is running cold, push the date back by a week rather than risk a lost planting: a replant from warm soil will outpace seeds sown too early into cold ground.

Top Growing Tips

• Soil must reach 65°F before sowing; cold soil causes rot, not germination
• Direct sow only: limas resist transplanting, and disturbing roots damages the nitrogen-fixing nodules
• Bush types mature in 60-80 days from sowing; pole types in 75-90 days
• Hold back on nitrogen fertilizer; limas fix their own, and excess nitrogen produces leaves instead of pods
• Shell while fresh for sweet, buttery flavor, or leave pods to dry fully on the vine for dried beans
• Pick every 2-3 days to keep plants producing through the season

Watering

Lima beans need consistent moisture but not a waterlogged bed, and they tolerate brief dry spells better than snap beans.

During germination, keep the soil evenly moist until seedlings emerge. Once plants are established, water deeply once or twice a week, letting the top inch of soil dry between sessions. Two windows matter most: flowering and pod fill. Inconsistent moisture during flowering contributes to blossom drop; dry spells during pod development produce undersized beans.

Water at the base of the plant rather than overhead. Wet foliage in warm weather invites fungal leaf diseases. Drip irrigation or a soaker hose works well. A 2-inch layer of straw or shredded leaves around the base holds soil moisture and moderates temperature through the hottest weeks.

Saturated soil causes root rot, particularly early in the season when nights are still cool. If water stands in the bed for more than a few hours after rain, amend the planting area with compost or consider raised beds.

Companion Planting

Good companions: Corn is the classic pairing: pole limas can climb the stalks in a Three Sisters combination, and the beans return nitrogen to soil that corn depletes. Cucumbers share similar warmth requirements and don’t compete below ground. Summer savory is worth planting along any bean row: it reportedly deters Mexican bean beetles and, according to generations of kitchen gardeners, improves the flavor of the beans themselves.

Avoid planting near: Onions, garlic, and other alliums inhibit bean growth, likely through allelopathic compounds released into the root zone. Keep fennel well away from the bean bed; it suppresses most vegetables it grows near.

One practical note: avoid deep cultivation under bean plants at any stage. The nitrogen-fixing root nodules are shallow and easily damaged by a hoe or trowel pushed too deep.

Common Problems

Flower drop is the most common lima bean frustration. Cool nights below 55°F trigger it, particularly on large-seeded varieties like Fordhook 242 and King of the Garden. Small-seeded baby limas handle cool nights better. Heat spikes above 90°F can also cause drop; plants typically resume setting pods once temperatures stabilize.

Mexican bean beetle looks like a copper-colored ladybug. Adults and their spiny yellow larvae feed on leaf undersides, leaving a skeletonized look. Check weekly and handpick egg clusters: small, yellow, and arranged in neat rows on leaf undersides. Row cover over seedlings delays beetle arrival; planting summer savory nearby discourages them through the season.

Aphids colonize new growth and leaf undersides. A strong spray of water knocks most off. Avoid high-nitrogen fertilizer, which produces the lush, soft growth aphids prefer.

Fungal leaf diseases (bean rust, downy mildew, bacterial brown spot) spread faster on wet foliage. Water at the base, space plants to allow airflow, and stay out of the bed when leaves are wet. Remove affected leaves promptly to slow spread.

Root rot is almost always a planting-too-early problem. Cold, wet soil at germination sets it up. If you lose a planting, wait an extra week before resowing and confirm the bed drains freely after rain.

Harvest Timeline

Bush limas reach harvest in 60-80 days from direct sowing; pole types in 75-90 days.

The signal to pick: pods that feel plump and bumpy, with the outline of the beans visible when you press the pod from outside, and the pod itself still green. Once pods begin to yellow, the beans inside have turned starchy and lost the sweet, buttery texture that makes fresh limas worth growing.

Pick every 2-3 days. Regular harvesting signals the plant to keep flowering and setting pods. Letting pods mature and dry on the vine sends the opposite signal and shuts down new production.

For dried beans, stop picking and leave pods on the vine until they turn papery and the seeds rattle inside. Pull the whole plant at that point, hang it upside down in a dry, airy spot for another week, then shell. Dried limas store well in an airtight container for a year or more.

Zone notes: Zones 9-11 have time for a second sowing of a fast-maturing bush variety (60-75 days) about 8-10 weeks before fall temperatures cool nights below 60°F. In zones 5-6, the calendar dates give you barely enough time for one planting of a 60-75 day bush type; a pole variety requires 90 or more frost-free days from your sow date, so check your local last and first frost dates before committing to a pole type in a shorter season.