How to Grow Sweet Basil
Ocimum basilicum
Sweet Basil is a fragrant culinary herb beloved for its vibrant flavor in sauces, salads, and teas. Gardeners grow it to add fresh heat to dishes and enjoy its easy cultivation in sunny spots throughout the growing season.
📷 Wikimedia CommonsStarting Sweet Basil: indoors or direct sow?
🌾 Sow directly in the garden — Sweet Basil is not usually started indoors.
Do not transplant seedlings outdoors until all danger of frost has passed and soil temperatures are warm enough for this tender herb.
Soil, care & harvest
Prepare loose, well-draining soil with a pH between 6.0 and 7.0. Since this is a warm-season crop sensitive to cold, do not sow outdoors until after the last frost when the ground has warmed up. Start seeds indoors about 8 weeks before your expected planting date if you lack early warmth. Plant seeds at a depth of roughly 1/4 inch; they typically sprout within 5 to 10 days.
Space plants 12 to 18 inches apart to ensure good airflow and growth. Provide full sun or partial shade for at least four hours daily. Keep the soil consistently moist, aiming for about one inch of water per week. Apply a light layer of organic mulch around the base to retain moisture, but avoid piling it against the stems.
Watch for aphids, spider mites, Japanese beetles, and slugs; inspect leaves regularly and hand-pick pests or use insecticidal soap if needed. Prevent fungal issues like Fusarium wilt by ensuring proper drainage and avoiding overhead watering. Harvest leaves when the plant reaches maturity, typically around 74 days after sowing, snipping stems just above a leaf node to encourage bushier growth.
When to Plant Sweet Basil
Planting windows vary by USDA hardiness zone. Look up yours by ZIP code.
| Zone | Start Indoors | Direct Sow | Harvest |
|---|---|---|---|
| Zone 10 | January | — | April – December |
Companion Plants for Sweet Basil
✓ Good companions
Basil repels asparagus beetles and doesn't compete for root space
Basil improves soil health and repels carrot flies without root competition
Basil provides light shade for lettuce and repels aphids that damage leafy greens
Both plants repel aphids and whiteflies, creating a stronger pest deterrent
Both herbs have similar growing requirements and repel common garden pests
Similar water and nutrient needs, basil helps repel pests that affect parsley
Basil deters aphids and spider mites that commonly affect peppers
Basil repels tomato hornworms and aphids, may improve tomato flavor
✗ Keep away from
Allelopathic properties inhibit basil growth and development
Competes for similar nutrients and may stunt basil growth
Can inhibit basil germination and early growth through allelopathy
Nutrition Facts
Per 100g serving (USDA FoodData Central)
