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🔍 Click to enlargeherbannual💧 Hydroponic-Compatible
Basil
Ocimum basilicum
Aromatic culinary herb that loves heat. Essential for Italian cooking.
Quick Facts
Sun:☀️ Full Sun
Water:💧💧 Moderate
USDA Zones:Zones 4–11
Space:🪴 Container, 🌱 Small Bed, 🏡 Large Garden
Soil:Loam, Silty
Best Season(s):Spring, Summer
Experience Level:🌱 Beginner
Native Range:Tropical Asia (India)
Bloom Color:White to pale purple (pinch off to keep the plant productive)
Bloom Cycle:Bolts to bloom in heat or as the season ends
Days to Harvest:20–25 days in hydro
Harvest Pattern:Continuous / cut-and-come-again
Care Notes
Pinch flowers immediately to keep leaves coming. Sensitive to cold.
💧 Hydroponic Notes
One of the best herbs for hydroponics — grows 30–50% faster than in soil. Works in any system. Keep at 65–80°F. Pinch flowers to maximize leaf production.
Growing Details
Mature Size:1-2.5 ft tall, 1-1.5 ft wide
Growth Rate:🐇 Fast
Zone Performance
As a true tender annual, basil grows the same way everywhere within its 4-11 range during the warm season; the real variable is season length, not zone character. In Zone 4-5, a short frost-free window means starting seed indoors and transplanting after all frost danger to get a full harvest before fall cold ends the plant, while Zones 9-11 allow direct sowing and multiple successive plantings through a long, hot growing season.
Companions & Wildlife
🦌 Deer Resistance
seldom damaged
The strong volatile-oil scent of basil foliage generally discourages browsing, though hungry deer may nibble young transplants.
🐝 Pollinator Value
moderate
If allowed to flower, basil's small white or purple spikes draw honeybees and small native bees, though most gardeners pinch blooms off before this happens.
Good Companions
Tomato — Classic kitchen and garden pairing — basil thrives in the same warm, sunny conditions tomatoes need, and many gardeners report reduced pest pressure when grown together.
Bell Pepper — Classic pairing — basil is reputed to improve pepper flavor and help repel common pests.
Hot Pepper — Classic pairing — basil is reputed to help repel common pepper pests.
Troubleshooting
⚠️ Fusarium wilt causing sudden one-sided wilting and yellowing
Remove and destroy infected plants immediately, avoid replanting basil in the same soil for 3+ years, and choose Fusarium-resistant varieties like 'Prospera' or 'Amazel'.
⚠️ Downy mildew showing as yellow patches on top of leaves with gray fuzz underneath
Increase air circulation by spacing plants further apart, water at the soil line rather than overhead, and plant resistant cultivars in humid climates.
⚠️ Plants bolting to flower and turning bitter in midsummer heat
Pinch flower spikes as soon as they appear and harvest the top third of stems weekly to keep the plant in vegetative growth.
⚠️ Blackened, mushy tissue after a cold night
Basil is damaged by temperatures below 50°F; cover plants or bring containers indoors whenever a cool night is forecast, even in summer.
✅ Pet Safety
Non-toxic to cats and dogs — a common, safe culinary herb for pets in small amounts.
Informational only — always check with a veterinarian if you suspect your pet has eaten something it shouldn't have.
🌿 Traditional & Medicinal Use
Traditional digestive and anti-inflammatory folk use — primarily valued as a culinary herb; see the Medicinal Herb Garden guide for more detail.
Informational only, not medical advice — consult a healthcare provider before using any plant medicinally.