How to Grow Purple Daikon Radish
Raphanus sativus 'Purple Daikon'
Purple Daikon Radish is a hardy root vegetable prized for its crisp texture and mild flavor. Gardeners grow this cool-season crop to enjoy fresh harvests in spring or fall gardens where it thrives under light frosts.
📷 Wikimedia CommonsStarting Purple Daikon Radish: indoors or direct sow?
🌾 Sow directly in the garden — Purple Daikon Radish is not usually started indoors.
This plant is best direct-sown in the garden rather than started indoors and transplanted later.
Soil, care & harvest
Prepare loose, fertile soil with a pH between 6.0 and 7.0 for optimal growth. As a cool-season crop, sow seeds directly outdoors two to six weeks before your last expected frost date. Press seeds gently into the soil at a depth of about one inch. Germination typically occurs within four to seven days under these conditions.
Space plants four to six inches apart to allow roots room to expand without competition. While this variety does not require trellising, keep the soil consistently moist with one to one-and-a-half inches of water weekly. Apply a light layer of mulch to retain moisture and suppress weeds, but avoid piling it against the developing roots.
Watch for flea beetles, cabbage root maggots, and aphids; use row covers or insecticidal soap if infestations appear. Prevent clubroot and black rot by rotating crops and ensuring good drainage. Harvest roots fifty-five to sixty-five days after sowing when they reach your preferred size by gently pulling them from the ground.
When to Plant Purple Daikon Radish
Planting windows vary by USDA hardiness zone. Look up yours by ZIP code.
| Zone | Start Indoors | Direct Sow | Harvest |
|---|---|---|---|
| Zone 1 | — | June – July | August – September |
| Zone 2 | — | May – July | July – September |
| Zone 3 | — | May – June | July – October |
| Zone 4 | — | April – June | June – October |
| Zone 5 | — | April – May | June – November |
| Zone 6 | — | April – May | June – November |
| Zone 7 | — | March – May | May – November |
| Zone 8 | — | March – April | May – December |
| Zone 9 | — | February – March | April – December |
| Zone 10 | — | January – March | March – December |
| Zone 11 | — | January – February | February – December |
| Zone 12 | — | January – February | February – December |
| Zone 13 | — | January – February | February – December |
Companion Plants for Purple Daikon Radish
✓ Good companions
Different root depths prevent competition, radishes break up soil for carrots
Repel root maggots and flea beetles that commonly attack radishes
Radishes repel cucumber beetles and squash bugs
Radishes mature quickly and break up soil for shallow lettuce roots
Repel nematodes and other soil pests that damage radish roots
Trap crop for flea beetles and aphids, protecting radish leaves
Peas fix nitrogen in soil which benefits radish growth
Cool-season crops with similar growing requirements, radishes improve soil structure
✗ Keep away from
Radishes can stunt grape growth and compete for soil nutrients
Inhibits growth of radishes and other brassica family plants
Same family (brassica) leads to increased pest pressure and soil nutrient depletion
Nutrition Facts
Per 100g serving (USDA FoodData Central)
