How to Grow Chocolate Basil
Helianthus annuus
Chocolate Basil is a popular culinary herb known for its rich, dark foliage and sweet flavor profile. Gardeners cultivate it to add aromatic depth to salads, teas, and savory dishes while enjoying its striking appearance in the garden.
📷 Wikimedia CommonsStarting Chocolate Basil: indoors or direct sow?
🌾 Sow directly in the garden — Chocolate Basil is not usually started indoors.
Since this is a warm-season crop sensitive to cold, do not start indoors before the last frost; instead, direct sow seeds or transplant established seedlings only once all danger of frost has passed and soil temperatures are warm.
Soil, care & harvest
Prepare loose, well-draining soil with a pH between 6.0 and 7.0. As a warm-season crop, you must wait until after the last spring frost when the soil is warm to sow directly or transplant seedlings. Press seeds gently into the soil surface without covering them deeply, as they require light for germination. Expect sprouts in five to ten days under these conditions.
Space plants twelve to fifteen inches apart to ensure proper air circulation and growth. Provide full sun exposure of at least six hours daily. Water regularly to maintain consistent moisture but avoid waterlogging the roots. Apply a light layer of mulch around the base to retain soil moisture, and feed occasionally with balanced fertilizer if growth seems sluggish.
Watch for aphids, spider mites, and Japanese beetles; remove them by hand or use insecticidal soap early to prevent damage. Monitor for Fusarium wilt, downy mildew, and bacterial leaf spot by ensuring good airflow and avoiding overhead watering. Harvest leaves or stems when the plant reaches maturity, typically sixty-five to seventy-five days after sowing.
When to Plant Chocolate Basil
Planting windows vary by USDA hardiness zone. Look up yours by ZIP code.
| Zone | Start Indoors | Direct Sow | Harvest |
|---|---|---|---|
| Zone 2 | April – May | — | August – September |
| Zone 3 | April – May | — | July – October |
| Zone 4 | March – April | — | July – October |
| Zone 5 | March – April | — | June – October |
| Zone 6 | March – April | — | June – November |
| Zone 7 | February – March | — | June – November |
| Zone 8 | February – March | — | May – December |
| Zone 9 | January – February | — | April – December |
| Zone 10 | January | — | April – December |
| Zone 11 | January | — | March – December |
Companion Plants for Chocolate Basil
✓ Good companions
Basil repels asparagus beetles and both have non-competing root systems
Basil helps repel carrot flies while carrots don't compete for nutrients
Basil provides light shade for lettuce and repels aphids and slugs
Both repel nematodes and aphids, creating a strong pest deterrent combination
Both herbs have similar growing requirements and repel similar pests
Compatible growth habits and both attract beneficial insects like hoverflies
Basil deters aphids, spider mites, and thrips that commonly attack peppers
Basil repels tomato hornworms and aphids, may enhance tomato flavor
✗ Keep away from
Inhibits growth of most garden plants including basil through allelopathy
Allelopathic plant that inhibits growth of basil and most herbs
Both compete for similar nutrients and sage may inhibit basil's growth
Nutrition Facts
Per 100g serving (USDA FoodData Central)
