How to Grow Daikon Radish Sakurajima

Daikon Radish Sakurajima

Raphanus sativus var. longipinnatus

vegetable

Sakurajima is a giant Japanese daikon radish variety known for producing massive, globe-shaped roots that can weigh 10-50 pounds at maturity. This heirloom cultivar has tender, mild white flesh and smooth skin, making it excellent for fresh eating, pickling, and cooking. It thrives in cool weather and is a staple in Asian cuisine.

Growing Conditions

☀️

Sun: Full sun, 6-8 hours daily minimum

💧

Water: Consistent moisture, 1-1.5 inches per week; keep soil evenly moist but not waterlogged to prevent root cracking and splitting

📏

Spacing: 8-12 inches between plants; thin seedlings aggressively to allow room for giant root development inches

📅

Days to maturity: 70-90 days from seed to harvest

🌱

Planting depth: 0.5-0.75 inches deep; sow seeds directly in garden

Soil

Type: Well-draining, loose, fertile loamy soil free of rocks and hard clods

pH: 6.0-7.0

Amendments:

Compost or aged manure Perlite or sand for deep loose structure Balanced NPK fertilizer

Growing Zones

Find your zone →

Thrives in zones 3-9; best growth in zones 4-8 with cool autumn temperatures

3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a

Growth Stages

Germination

3-7 days

Seeds sprout within 3-5 days with fine green cotyledons emerging from soil

Keep soil consistently moist; thin seedlings when 1-2 inches tall to 1 per pot or wider spacing

Seedling/Leaf Development

2-3 weeks

True leaves emerge; plant develops feathery green foliage with lobed, textured leaves

Thin to 8-12 inches apart; water regularly; begin fertilizing with balanced NPK every 2-3 weeks

Root Expansion

4-6 weeks

Root begins to swell visibly at soil surface; foliage becomes denser and more robust; white shoulder of radish appears above ground

Maintain consistent watering; mulch around base to retain moisture and keep root cool; weed carefully to avoid root damage; continue fertilizing

Bulking/Maturation

3-4 weeks

Root swells dramatically to giant size (10-50 lbs possible); skin becomes smooth and white; foliage reaches full size

Reduce nitrogen fertilizer to avoid excessive leaf growth; maintain even moisture; avoid overwatering to prevent splitting; monitor for pests and disease

Harvest

Harvest at peak; can store in ground for weeks in cool weather

Root has reached desired size; skin is firm and white; root crowns may protrude above soil surface

Loosen soil around radish before pulling; harvest before severe freezes; can be left in ground in cool climates for extended harvest

Companion Planting

Plan your garden →

Plant with:

Lettuce Spinach Carrot Beet Cabbage Broccoli Kale Cucumber Nasturtium Chives

Avoid planting near:

Fennel Dill Hyssop Other brassicas in tight rotation

Common Pests

Use row covers on seedlings; spray with neem oil or spinosad; dust with diatomaceous earth
Apply parasitic nematodes to soil; use row covers; practice crop rotation; remove affected plants
Use Bt (Bacillus thuringiensis); employ row covers; remove infected foliage; plant resistant varieties
and
Hand-pick; use copper tape; create barriers; apply slug pellets or beer traps
Spray with strong water jet; use insecticidal soap; introduce ladybugs; apply neem oil

Uses

🍳

Raw & Pickled

Culinary

Sakurajima radish is prized for its mild, tender flesh perfect for fresh slicing in salads and as a crunchy snack. Traditional Japanese pickles (takuan) and Korean kimchi use daikon extensively for its crisp texture and ability to absorb flavors. [source]

🍳

Cooking & Broths

Culinary

The mild flavor becomes sweet when cooked; excellent in stir-fries, soups, stews, and braised dishes. Japanese cuisine features daikon in oden, miso soup, and simmered preparations where it absorbs surrounding flavors. [source]

💊

Digestive Aid

Medicinal

Daikon radish contains enzymes that aid digestion of fats and carbohydrates, and is traditionally used in Asian medicine to support gastrointestinal health. The glucosinolates in raw daikon may offer anti-inflammatory benefits. [source]

🏠

Greens & Root Utilization

Household

The leafy tops are edible and nutritious, suitable for stir-frying or adding to soups much like mustard greens. Both root and greens reduce waste and maximize yield from a single plant. [source]

🦋

Garden Biodiversity

Wildlife

Daikon flowers (if allowed to bolt) attract pollinators and beneficial insects. The foliage provides habitat for predatory insects that help control garden pests. [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 roots reach desired size (typically 6-12 inches in diameter, but can grow much larger). Gently loosen soil around the root with a garden fork before pulling to avoid breakage. Sakurajima matures primarily in fall when temperatures cool. In cooler zones, plant in mid-summer (July-August) for autumn harvest. Can be left in ground in zones 3-7 for extended storage through winter with mulch protection. Check maturity by gently exposing the shoulder of the root at soil level. Harvest before severe freezes, or mulch heavily to preserve in-ground storage.

Fun Facts

🌱 Sakurajima daikon is named after the volcanic island of Sakurajima in Japan and is a cultural agricultural treasure; some specimens have been recorded weighing over 50 pounds, with the world record exceeding 68 pounds.
🌱 Daikon radish is one of the most consumed vegetables in Japan and East Asia, featuring prominently in traditional New Year celebrations and ceremonial dishes for centuries.
🌱 Unlike small European radishes, daikon becomes milder and sweeter the larger it grows, and stores exceptionally well in cool conditions for months, providing a fresh winter vegetable long after harvest.

Want personalized planting timelines?

Get started free