How to Grow Basil
Ocimum basilicum
Basil is a beloved warm-season herb known for its vibrant leaves and aromatic oils that elevate culinary dishes. Gardeners cultivate it primarily to harvest fresh foliage for cooking or to enjoy its ornamental appeal in sunny garden borders.
📷 Wikipedia: BasilStarting Basil: indoors or direct sow?
🌾 Sow directly in the garden — Basil is not usually started indoors.
Direct sow seeds outdoors only after all danger of frost has passed and soil is warm, or transplant seedlings immediately once nighttime temperatures stay above freezing.
Soil, care & harvest
Prepare loose, fertile soil with a pH between 6.0 and 7.5 before planting. As a warm-season crop, start seeds indoors only after the last spring frost when soil temperatures are consistently above 35°F. Sow seeds about one-quarter inch deep; they typically germinate within five to ten days once warmth is established.
Space plants ten to twelve inches apart to ensure adequate airflow and growth. Basil thrives in full sun but requires consistent moisture, so water regularly to keep the soil evenly moist without waterlogging. Apply a light layer of organic mulch around the base to retain moisture and suppress weeds while feeding with balanced fertilizer if leaves show signs of nutrient deficiency.
Watch for aphids, spider mites, and fungal issues like downy mildew; prevent pests by inspecting plants often and using insecticidal soap if needed. Harvest leaves when the plant reaches maturity, typically sixty to ninety days after sowing. Snip stems just above a leaf pair to encourage bushier growth and continuous production throughout the growing season.
When to Plant Basil
Planting windows vary by USDA hardiness zone. Look up yours by ZIP code.
| Zone | Start Indoors | Direct Sow | Harvest |
|---|---|---|---|
| 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 |
