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How to Grow Spanish Peanut

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Spanish Peanut

Arachis hypogaea subsp. fastigiata

vegetable

Spanish peanuts are a smaller, higher-oil variety of the common groundnut, producing compact plants with small pods containing 2-3 kernels each. Known for their superior flavor and oil content, they're excellent for roasting, candy production, and peanut butter. This variety matures relatively quickly and thrives in warm climates with well-drained soil.

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Example Spanish Peanut timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Spanish Peanut

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. Harvest Spanish Peanut

    Around Aug 15

    ≈ 120 days after planting

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

Growing Conditions

☀️
Sun: Full sun, 8+ hours daily; requires intense heat and light
💧
Water: Moderate, consistent moisture; 15-20 inches total during growing season. Water deeply but allow soil to dry slightly between waterings. Critical moisture during pod development (80-120 days after planting).
📏
Spacing: 6 inches
📅
Days to maturity: 120-140
🌱
Planting depth: 1.5-2 inches

Soil

Type: Well-draining sandy loam to sandy soil
pH: 5.9-6.3
Amendments:
Calcium (gypsum or lime) Boron (if deficient) Compost for organic matter Avoid excessive nitrogen

Growing Zones

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Thrives in zones 8-11; requires 120-140 frost-free days and warm soil temperatures

8a 8b 9a 9b 10a 10b 11a 11b

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Growth Stages

1

Sprouting

7-14 days

Seedlings emerge with cotyledons, developing first true leaves. Soil temperature should be 65-70°F minimum.

Ensure consistent soil moisture. Maintain warm temperatures. Protect from wind if possible. Thin seedlings to proper spacing early.

2

Vegetative Growth

30-50 days

Plant develops bushy foliage with pinnate compound leaves. Lateral branches form close to the soil. Above-ground growth is relatively compact in Spanish varieties.

Maintain consistent watering. Do not over-fertilize, especially with nitrogen. Monitor for pests and diseases. Keep soil warm (ideal 70-80°F).

3

Flowering

40-60 days

Yellow flowers appear in leaf axils. Flowers are small, self-pollinating, and typically appear above ground. After pollination, the ovary develops a gynophore (peg) that elongates downward.

Maintain adequate moisture during flowering. Ensure soil is loose to allow peg penetration. Critical calcium availability prevents pod defects.

4

Peg Penetration & Pod Development

40-70 days

Gynophores push into soil and develop into pods underground. This is the most critical stage. Pods enlarge and fill with kernels over 30-50 days.

Maintain consistent moisture; this is the driest-sensitive period. Ensure soil is loose and well-draining. Do not allow soil to crust over. Mulch lightly to retain moisture and keep soil warm.

5

Maturation & Harvest

10-20 days before harvest

Plant foliage begins to yellow and senesce. Pods mature underground, reaching full size. Shell hardens and kernel fill is complete.

Reduce watering gradually as plants mature. Monitor for harvest readiness by digging test plants. Harvest when 75-80% of pods are mature (inner shells become papery brown).

Companion Planting

Plan your garden →

Plant with:

Corn Squash Cucumbers Cotton Tobacco Sugarcane

Avoid planting near:

Potatoes Tomatoes Peppers Other legumes (in heavy rotation) Onions and garlic

Common Pests

  • Monitor for damage to flowers and pods. Use pheromone traps. Bacillus thuringiensis (Bt) sprays effective if caught early. Cultural practices like crop rotation help.

  • Spray with insecticidal soap or neem oil. Monitor young plants closely. Remove heavily infested plants.

  • Increase humidity and irrigation. Spray with water to dislodge. Use neem oil or sulfur-based fungicides/miticides if infestation severe.

  • Ensure good air circulation. Remove affected leaves. Apply fungicide (copper or sulfur) if severe. Practice crop rotation.

  • Maintain proper moisture levels. Avoid drought stress. Ensure proper drying and storage. Use resistant varieties when available.

  • Rotate crops away from grains. Plow under crop residues. Use baits or beneficial nematodes in severe infestations.

Uses

🍳

Roasting & Snacking

Culinary

Spanish peanuts are prized for roasting due to their smaller size, thin skin, and sweet flavor. High oil content (48-50%) makes them ideal for oil production and nut butters. [source]

🍳

Candy & Confectionery

Culinary

Smaller kernels and superior sweetness make Spanish peanuts the preferred variety for peanut candy, brittle, and chocolate-covered peanuts. [source]

🏠

Oil Extraction

Household

Spanish peanut oil is cold-pressed or expeller-pressed for culinary use and has high oxidative stability. Used in cooking, cosmetics, and industrial applications. [source]

💊

Nutritional Benefits

Medicinal

Rich in plant-based protein (25%), healthy monounsaturated fats, vitamin E, magnesium, and resveratrol. Supports heart health and provides sustained energy. [source]

🦋

Wildlife Feed

Wildlife

In-shell peanuts are excellent supplemental feed for squirrels, birds, and other wildlife. Can be left for wildlife or used in feeders. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Harvest when lower leaves yellow and vines begin to senesce (typically 120-140 days). Dig carefully to avoid damaging pods; use a fork to lift plants. Shake loose soil gently. Hang plants upside down or lay flat to cure in warm, dry location for 2-4 weeks until shells feel papery. Remove pods from vines. Store in cool, dry location (below 10% moisture content) at 50-60°F. Spanish peanuts typically yield 2,000-4,000 lbs per acre in good conditions.

Fun Facts

  • 🌱 Peanuts are legumes that grow underground—the flower stem (gynophore) bends down after pollination to push the developing pod into the soil, earning the name 'groundnut.'
  • 🌱 Spanish peanuts are the smallest variety but contain the highest oil content (48-50%) and are the primary type used in peanut oil production and candy manufacturing.
  • 🌱 A single peanut plant can produce 30-40 pods, and peanut cultivation has a natural nitrogen-fixing relationship with soil bacteria, improving soil fertility for subsequent crops.

Gardening Terms

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

Full Sun Mulch pH Pollination True Leaves
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