How to Grow Radar Potato

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Radar Potato

Solanum tuberosum 'Radar'

vegetable

Radar is an early-maturing potato variety known for its red skin and yellow flesh, offering excellent disease resistance and reliable yields. It was developed in the Netherlands and is particularly valued for its resistance to late blight, a devastating potato disease. This versatile potato works well for boiling, steaming, and salads due to its waxy texture.

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Example Radar Potato timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Radar Potato

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. Harvest Radar Potato

    Around Jun 21

    ≈ 65 days after planting

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

Growing Conditions

☀️
Sun: Full sun, 6-8 hours daily minimum
💧
Water: Consistent moisture; provide 1-2 inches per week through rainfall or irrigation. Water deeply but avoid waterlogging. Mulch to retain moisture and regulate soil temperature.
📏
Spacing: 12 inches
📅
Days to maturity: 65-85
🌱
Planting depth: 4 inches

Soil

Type: Well-draining, loose, fertile loamy soil with good organic matter
pH: 5.0-6.8
Amendments:
Compost aged manure peat moss sulfur if pH is too high

Growing Zones

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Thrives in zones 3-8; prefers cooler climates but adapts well across most of North America

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

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Growth Stages

1

Seed Piece Preparation & Planting

1 week

Cut seed potatoes into 1.5-2 oz pieces with at least 2 eyes each. Plant pieces 4 inches deep in prepared soil after last frost date.

Allow cut pieces to cure for 1-2 days before planting to prevent rot. Plant when soil temperature reaches 45°F. Space 12 inches apart in rows 24-30 inches apart.

2

Emergence & Early Growth

3-4 weeks

Sprouts emerge 2-3 weeks after planting. Plants develop first true leaves and begin establishing root systems and underground stolons.

Ensure consistent moisture. Begin hilling (mounding soil around plants) when plants are 6-8 inches tall to prevent greening of tubers. Keep soil weed-free.

3

Vegetative Growth & Tuber Initiation

3-4 weeks

Plants grow vigorously with multiple stems and compound leaves. Tuber initiation begins beneath the soil as stolons develop into small tubers.

Continue hilling as plants grow to ensure tubers stay covered. Maintain consistent watering (1-2 inches per week). Monitor for early blight and late blight. Apply disease-preventive fungicides if needed.

4

Tuber Bulking

3-4 weeks

Tubers rapidly increase in size and develop their characteristic red skin. Plant foliage reaches full size and flowering begins.

This is the most critical growth stage for yield. Maintain even soil moisture to prevent cracking and misshapen tubers. Continue fungicide applications as a preventive measure, especially in humid conditions. Do not let soil dry out completely.

5

Maturity & Harvest Readiness

2-3 weeks

Foliage begins to yellow and senesce (age). Tuber skin hardens and thickens, ready for harvest. Radar typically matures in 65-85 days.

Stop watering about 2 weeks before harvest to allow skins to set and wounds to heal. Harvest when foliage is mostly dead. Use a fork or spade carefully to avoid bruising tubers. Cure harvested potatoes in a cool (45-50°F), humid, dark location for 10-14 days before storage.

Companion Planting

Plan your garden →

Plant with:

Avoid planting near:

Brassicas (cabbage, broccoli) Fennel Tomatoes Peppers Eggplant Onions Sunflowers

Common Pests

  • Hand-pick adults and eggs; use row covers on young plants; apply spinosad or neem oil; crop rotation; encourage beneficial beetles

  • Use row covers; apply insecticidal soap or neem oil; maintain plant vigor; reflective mulches deter adults

  • Yellow sticky traps; reflective mulches; neem oil sprays; encourage natural predators like parasitic wasps

  • Strong water spray to dislodge; neem oil; insecticidal soap; reflective mulches; encourage ladybugs and lacewings

  • Crop rotation; deep cultivation to expose larvae; parasitic nematodes; avoid planting where sod was recently turned; trap crops

Uses

🍳

Boiling & Salads

Culinary

Radar's waxy, yellow flesh and firm texture make it ideal for boiling whole, cubing for potato salads, and serving with butter and herbs. Its low starch content prevents mushiness during cooking. [source]

🍳

Traditional European Cooking

Culinary

Popular in Dutch and German cuisine for salads and classic side dishes. The firm flesh holds shape well during preparation and cooking. [source]

💊

Nutritional Source

Medicinal

Potatoes are rich in potassium, vitamin B6, and vitamin C, supporting heart health and immune function. Red-skinned varieties contain higher levels of anthocyanins and antioxidants. [source]

🏠

Disease-Resistant Home Growing

Household

Radar's strong resistance to late blight makes it an excellent choice for organic and sustainable home gardening, reducing the need for fungicide applications and increasing harvest reliability. [source]

🦋

Garden Biodiversity

Wildlife

Potato plants attract beneficial insects including parasitic wasps and ladybugs that prey on garden pests. The flowers provide early-season forage for pollinators. [source]

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

Harvest Tips

Radar is an early-maturing variety ready to harvest 65-85 days after planting. For new potatoes, harvest when plants begin to flower (about 50-60 days). For full-size potatoes, wait until foliage dies back completely and skins have hardened. Dig carefully with a spade or fork, working from the sides to avoid puncturing tubers. Handle gently to prevent bruising. Harvest on a dry day if possible. After digging, cure harvested potatoes in darkness at 45-50°F and 90-95% humidity for 10-14 days to heal skin wounds before storage.

Fun Facts

  • 🌱 Radar was bred in the Netherlands and named for its reliable, rapid detection of when it's ready to harvest—the foliage dies back clearly and predictably.
  • 🌱 This variety has been grown commercially since the 1970s and remains one of the most disease-resistant early potato varieties available, bred specifically to resist late blight caused by Phytophthora infestans, the same pathogen responsible for the Irish Potato Famine.
  • 🌱 Radar potatoes develop their characteristic bright red skin only after exposure to light during the growing season; completely covered tubers will remain pale or white underneath.

Gardening Terms

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