How to Grow Purple Pea

Wikimedia Commons

Purple Pea

Lathyrus sativus

vegetable

Purple pea is a cool-season legume grown for its nutritious purple-colored pods and seeds, which contain higher protein and fiber than common green peas. This climbing or bushy plant is gaining popularity in sustainable agriculture and specialty gardening for both culinary use and soil enrichment. The distinctive purple coloring comes from anthocyanin pigments, making it both visually striking and nutritionally dense.

Looking for a specific variety?

Black-seeded Spanish White Eston Bangali Indian Purple

When should you plant Purple Pea in your zone?

Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.

Get my Purple Pea timeline →

Example Purple Pea timeline · Pittsburgh, PA (Zone 6b)

Plant Purple Pea
Around Apr 17

Near Pittsburgh's average last spring frost.
Tend & protect
Late spring–summer

Watering, feeding, and pest-watch reminders.
Harvest Purple Pea
Around Jun 16

≈ 60 days after planting

Sample dates for Pittsburgh, PA. Sign up to get exact Purple Pea dates for your own zip code.

Growing Conditions

☀️

Sun: Full sun to partial shade; 6+ hours of direct sunlight daily

💧

Water: Moderate, consistent moisture; water 1-1.5 inches per week. Reduce watering once flowering begins to avoid excessive vegetative growth. Avoid waterlogging.

📏

Spacing: 4 inches

📅

Days to maturity: 60-90 days

🌱

Planting depth: 1-1.5 inches

Soil

Type: Well-draining loamy soil rich in organic matter

pH: 6.0-7.0

Amendments:

Compost or well-rotted manure Inoculant for nitrogen-fixing bacteria (Rhizobium) Avoid excess nitrogen fertilizer

Growing Zones

Find your zone →

Thrives in zones 3-8; prefers cool seasons

3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b

Get my Purple Pea timeline →

Growth Stages

Germination

1-2 weeks

Seeds sprout and first cotyledons emerge. Root system begins developing.

Keep soil consistently moist but not waterlogged. Maintain soil temperature between 45-65°F for optimal germination. Provide good drainage to prevent rot.

Seedling & Early Vegetative

2-3 weeks

True leaves emerge and plants develop primary foliage. Climbing varieties begin producing tendrils.

Thin seedlings to proper spacing. Provide support structure (trellis, stakes, or netting) for climbing varieties. Keep soil consistently moist. Avoid high nitrogen to prevent excessive leafy growth.

Vegetative Growth

3-4 weeks

Plants establish strong vines with full foliage coverage. Tendrils grip support structures. Stems thicken and plant height increases.

Maintain consistent moisture without waterlogging. Monitor for pests and diseases. Ensure supports are sturdy enough to handle plant weight. Side-dress with compost if needed for soil enrichment.

Flowering & Pod Development

2-3 weeks

Purple or white flowers bloom along the vine, followed by pod formation. Young pods develop the characteristic purple color.

Reduce watering frequency to encourage flowering and pod set. Stop nitrogen fertilizer completely. Provide consistent, even moisture during pod development. Remove any diseased or damaged pods promptly.

Fruiting & Harvest Readiness

2-3 weeks

Pods mature and deepen in purple color (if harvesting fresh). Seeds inside develop and harden. Pods may turn dry and brown if left to full maturity.

Begin harvesting at desired stage—pick young pods for tender eating, or allow full maturity for dried seeds. Harvest regularly to encourage continued production. Allow some pods to fully mature and dry on vine for seed saving.

Companion Planting

Plan your garden →

Plant with:

Carrots Corn Cucumber Lettuce Radish Spinach Turnip

Avoid planting near:

Garlic Onion Fennel Other legumes in same family (due to disease cross-contamination)

Common Pests

Spray with strong water stream; use insecticidal soap; introduce ladybugs; neem oil as last resort
Row covers over young plants; early planting to avoid peak flight; remove infested pods immediately
Increase humidity; spray with water; neem oil; ensure adequate moisture in soil
Remove heavily infested leaves; use blue sticky traps; spray with insecticidal soap if severe
Ensure good air circulation; avoid overhead watering; spray with sulfur dust or baking soda solution; remove infected leaves

Uses

🍳

Fresh Pods & Tender Eating

Culinary

Young purple pods can be eaten fresh like snow peas or sugar snap peas, steamed, stir-fried, or added to salads. They have a slightly sweet, delicate flavor and tender texture when harvested early. [source]

🍳

Dried Pulses & Protein

Culinary

Mature dried seeds are high in protein and fiber, and can be boiled or pressure-cooked for soups, curries, dal, and grain bowls. Purple peas have superior nutritional value compared to common split peas. [source]

💊

Nutritional & Antioxidant Properties

Medicinal

Purple peas are rich in anthocyanins and other polyphenols with antioxidant properties. They support cardiovascular health, provide sustained energy, and contribute to digestive wellness through high fiber content. [source]

🏠

Soil Improvement & Nitrogen Fixation

Household

As a legume, purple peas form symbiotic relationships with nitrogen-fixing bacteria, naturally enriching soil with nitrogen. Left to mature or used as a cover crop, they reduce the need for synthetic fertilizers and improve soil structure. [source]

🦋

Pollinator & Wildlife Support

Wildlife

Purple pea flowers attract bees, butterflies, and other pollinators. The vines provide shelter and food sources for beneficial insects, making them valuable in permaculture and wildlife-friendly gardens. [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 eating, harvest pods when they are young, tender, and bright purple (45-60 days after planting)—snap or cut from the vine. For dried seeds/pulses, allow pods to fully mature and dry on the vine until brown and papery, then harvest and shell seeds. Regular harvesting of young pods encourages more flowering and extends production period.

Fun Facts

🌱 Purple peas have been cultivated in South Asia and the Mediterranean for thousands of years and remain a staple in Indian, Ethiopian, and Mediterranean cuisines.
🌱 The purple pigmentation in the pods and seeds comes from anthocyanins, the same antioxidants found in blueberries and blackberries, making purple peas a nutritional powerhouse.
🌱 Unlike common garden peas, purple peas are more drought-tolerant and require less water, making them an excellent choice for sustainable and low-water gardening systems.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Compost Full Sun Germination Partial Shade Trellis True Leaves

Shop Purple Pea plants and related plants at Plant Addicts →

Join 30,000 gardeners planning their gardens with LizPlants.

Get your personalized Purple Pea planting timeline

Tell us your zip code and we'll calculate exactly when to start Purple Pea seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.

Get my Purple Pea timeline →