Watermelon, Radish Seeds

Watermelon Radish Seed

Pale green skin reveals a dazzling watermelon-pink center
Large rounds may reach four inches
Cool weather develops sweeter, milder flavor
Beautiful sliced, pickled, or served raw

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Key Attributes

Botanical Name

Raphanus sativus

Days to maturity

55 Days

Sun

Full Sun

Packet

500 Seeds

About Watermelon, Radish Seed, Radish Seed

Watermelon radish is a striking and flavorful root vegetable that adds both color and variety to the garden. Known for its vibrant pink to red interior, which contrasts with its pale greenish-white skin, this radish variety is a favorite among gardeners looking for something unique. Watermelon radishes are cool-season crops, thriving in the early spring or fall when temperatures are mild.

Growing details

Planting

Sow Depth

1/2"

Days to Germination

3–10 days

In-row plant spacing

1-2"

Row Spacing

12-18"

Plant profile

Maturity

Spring, Fall

Life Cycle

Annual

Plant Height

24 inches

Growth Habits

Rosette, Upright

Type

ROUND RADISHES

Seed & variety

Seeds Per Ounce

2,844

Color

Green

Seed Type

Open Pollinated

Growing Season

Cool-Season Crop

Before Planting

Give Radish a full-sun site with deep, loose, well-drained soil. Remove stones, clods, roots, and undecomposed organic matter, then work the bed to a fine texture so radish roots can develop evenly. Avoid fresh manure and excessive nitrogen, and correct soil fertility only as indicated by a soil test.

Planting

Direct sow radishes in cool soil from early spring, repeating small plantings every 1–2 weeks until warm weather. Sow again in late summer for a fall crop. Maintain consistent moisture during emergence and thin promptly after seedlings develop their first true leaves. Thin round radishes to about 2 inches apart and large daikon types to 4–6 inches.

Watering

Maintain consistent moisture around developing radish roots. Water gently and deeply during dry weather, avoiding both drought stress and sudden heavy irrigation that may split or distort the crop.

Fertilizer

Feed radish sparingly with a balanced fertilizer when soil fertility is low. Too much nitrogen produces lush tops, delayed roots, and inferior shape or flavor.

Harvesting

Pull radishes when roots reach the expected diameter and color but before they become pithy, woody, or overly hot. Check frequently during warm weather, since roots can pass peak quality quickly.

Tips

Prevent competition by keeping radish beds weed-free from emergence onward. Avoid compacting the soil, thin before roots crowd, and sample roots regularly so they do not become oversized.

AVG. Seeding Rate

1 oz./70', 14 oz./1,000', 31 lb./acre in rows 12" apart.

Pests & Diseases

Downy mildew, black root, clubroot, white rust, and bacterial black rot affect radishes. Use clean seed, rotate brassicas, and avoid moving infested soil. Harvest promptly and discard roots with dark internal discoloration, swollen feeder roots, or soft lesions; remove volunteer radishes between crops.

Radish may attract cabbageworms, loopers, aphids, flea beetles, and slugs. Inspect frequently, use physical barriers early, and choose targeted biological controls instead of broad-spectrum insecticides.