How to Grow Koji
Brassica rapa
Your complete guide to growing Koji.
📷 Wikipedia: Brassica rapaWhen to Plant Koji
Planting windows vary by USDA hardiness zone. Look up yours by ZIP code.
| Zone | Start Indoors | Direct Sow | Harvest |
|---|---|---|---|
| Zone 1 | — | June – July | June – September |
| Zone 2 | — | May – July | June – September |
| Zone 3 | — | May – June | May – October |
| Zone 4 | — | April – June | May – October |
| Zone 5 | — | April – May | May – November |
| Zone 6 | — | April – May | April – November |
| Zone 7 | — | March – May | April – November |
| Zone 8 | — | March – April | March – December |
| Zone 9 | — | February – March | February – December |
| Zone 10 | — | January – March | February – December |
| Zone 11 | — | January – February | January – December |
| Zone 12 | — | January – February | January – December |
| Zone 13 | — | January – February | January – December |
Companion Plants for Koji
✓ Good companions
Loosens soil for lettuce roots and doesn't compete for nutrients
Repels aphids and improves lettuce flavor when planted nearby
Attracts beneficial insects and may improve lettuce growth
Repels slugs, snails, and aphids that commonly attack lettuce
Natural pest deterrent, repels nematodes and aphids
Acts as trap crop for aphids and cucumber beetles
Quick-growing, breaks up soil, and helps deter flea beetles
Similar growing requirements and harvest times, efficient space usage
✗ Keep away from
Heavy feeder that competes for nutrients and can shade lettuce
Can stunt lettuce growth when planted too close together
Allelopathic compounds inhibit lettuce germination and growth
Nutrition Facts
Per 100g serving (USDA FoodData Central)
