How to Grow Custard Bean
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Custard Bean
Phaseolus lunatus
vegetableCustard beans, also known as lima beans or butter beans, are warm-season legumes that produce creamy, nutrient-rich pods and seeds. These climbing or bushy plants are prized for their smooth, starchy beans that develop inside large, flattened pods. They require warm soil and consistent moisture to thrive.
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Example Custard Bean timeline · Pittsburgh, PA (Zone 6b)
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Plant Custard Bean
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Custard Bean
Around Jun 26≈ 70 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Custard Bean dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 5-9; plant after all frost danger has passed
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Germination & Seedling
1-2 weeksSeeds sprout and develop the first true leaves within 7-10 days in warm soil (70-80°F)
Ensure soil stays warm and moist; protect from cool temperatures which cause rot. Thin seedlings to proper spacing.
Vegetative Growth
3-4 weeksPlants develop multiple stems and leaflets; bushy or vining growth depending on variety
Provide stakes or trellises for pole varieties. Avoid high-nitrogen fertilizers that promote excessive foliage at the expense of flowering.
Flowering
2-3 weeksSmall white, pink, or purple flowers appear in clusters along the stems
Ensure consistent moisture and warm temperatures (70-85°F). Provide support structures. Avoid disturbing plants when flowering.
Pod Development & Maturation
4-6 weeksFlowers fade and plump green pods form and enlarge; pods gradually dry and pale as seeds mature inside
Reduce watering slightly once pods have set. Watch for pests. Continue regular monitoring.
Harvest-Ready
Ongoing through frostPods are full-sized with visible bean shapes; shells dry and lighten in color when fully mature
For fresh beans, pick when pods are full but still green. For dry beans, allow pods to brown and dry on the plant before harvesting.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Hand-pick adults and larvae daily; use neem oil or insecticidal soap; plant row covers over seedlings
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Spray with water to dislodge; apply neem oil or insecticidal soap; encourage beneficial insects
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Increase humidity; spray with water; apply neem oil if severe
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Use yellow sticky traps; spray with insecticidal soap; encourage predatory wasps
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and
(fungal diseases)
Improve air circulation; avoid wetting foliage; remove infected leaves; apply copper fungicide if needed
Uses
Creamy cooked vegetable
CulinaryFresh or dried custard beans are boiled or steamed until tender and buttery, served as a side dish or added to stews. The starchy texture makes them ideal for mashing or pureeing into soups. [source]
Protein-rich staple grain
CulinaryDried custard beans are a valuable source of plant-based protein and fiber, used in salads, curries, casseroles, and regional cuisines worldwide. [source]
Blood sugar regulation
MedicinalThe polyphenols and soluble fiber in custard beans may help stabilize blood glucose levels and support digestive health when consumed regularly. [source]
Seed saving and storage
HouseholdFully dried custard beans store for years in cool, dry conditions, making them an ideal crop for home preservation, long-term pantry storage, and seed saving for the next season. [source]
Garden nitrogen fixation
WildlifeLike all legumes, custard beans form symbiotic relationships with nitrogen-fixing bacteria in root nodules, enriching the soil naturally and reducing the need for synthetic fertilizers. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
For fresh (butter) beans, harvest pods when full and tender, 3-4 days after the pods stop growing (usually before beans dry). For dry custard beans, allow pods to brown fully on the plant, then harvest, shell, and dry indoors for 2-3 weeks. Use pruning shears to avoid damaging vines.
Fun Facts
- 🌱 Custard beans are called 'lima beans' after Lima, Peru, where they originated over 7,000 years ago and were a staple crop of the Inca civilization.
- 🌱 The creamy, pale interior of custard beans inspired their colloquial name 'butter beans' in the southern United States, where they remain a beloved comfort food.
- 🌱 Custard beans contain a mild compound called linamarin that breaks down into cyanide when raw; cooking completely neutralizes this, making them perfectly safe and highly nutritious.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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