Holy Basil (Ocimum tenuiflorum)
2 sources cited · Verified
The short answer
- Ready in
- 56–70 days
- Site
- 4+ hours of sun, soil pH 6–7
- Biggest risk
- Powdery mildew
In the UK, holy basils are ready to harvest 56–70 days after planting.
Holy basils (Ocimum tenuiflorum) — Small, upright, bushy annual (in temperate climates) with highly aromatic, serrated, purple-green leaves used both….
This is a frost-tender crop — it will not survive below about 5°C — so in UK conditions the growing year is built around starting it under cover and moving it out only once the risk has passed.
Core growing advice on this page is checked against named horticultural sources — see References.
Soil & Growing Conditions
Quick Facts
At a Glance
Growth Stages
Harvest & Storage
Diseases
Pests
Holy Basil Photo Gallery
References
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Hardiness: true perennial in USDA zones 10-11 (stays above freezing); grown as a tender annual or houseplant in zone 9 and colder. Soil/site: well-drained potting mix in containers, adaptable to garden soils from heavy clay to sandy; pH 6.0-7.0; 4-6 hours direct sun minimum. Spacing: 12-18in apart in full sun. Sowing: indoors 6-12 weeks before last spring frost; press seed gently onto moist mix, thin soil covering; soil temperature minimum 70F, optimal 75-80F; germinates in roughly 1-3 weeks; transplant outdoors only once nighttime temps reliably above 50F. Harvest: begin once the plant is about a foot tall, usually 8-10 weeks from seed; pinch individual leaves or short branch tips as needed; at season end, cut the entire plant at ground level just before first frost. Pinching: pinch growing tips every few weeks during active growth to encourage branching; cut the main stem back to lower sprouting leaves for a bushier shape. Drying/storage: tie stems into small bundles, hang upside down to dry 1-2 weeks, then strip leaves once crisp and store in sealed glass jars away from light -- keeps flavour and aroma at least a year.
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Soil: loam, sand; well-drained; pH acid, alkaline or neutral. Sun/aspect: full sun, south/west-facing. Exposure: sheltered. Size: 0.1-0.5m height/spread, matures within 1-2 years. Hardiness H1C (grown outdoors in UK summer only, minimum 5-10C). Propagate by seed in gentle heat in spring under glass or indoors. Pruning: pinch out flower heads as they appear to encourage continued leaf growth; if left to flower, cut back after flowering. Pests: aphids, leafhoppers. Diseases: powdery mildews. Cultivate as an annual indoors in a sheltered sunny position, moist but well-drained soil, moving outdoors in summer; container growing recommended.
2 independent sources are cited for this crop. Where they disagree - soil pH is the clearest case - every figure is preserved rather than averaged into false precision.
Frequently Asked Questions
How long do holy basils take to grow?
Typically 56–70 days, depending on cultivar and growing conditions.
What soil pH do holy basils need?
A pH of about 6–7. That span reflects genuine variation between the authorities we cite rather than a single agreed figure — the References section lists each source's exact range.
What problems affect holy basils?
Our data links 1 disease and 2 pests to this crop. See the sections above for each one and how to manage it.
Plan next season before the problems start
This page gives you the thresholds; the planner turns them into your own calendar. It works from what you can observe and measure in your garden rather than from dates written for somebody else’s latitude.
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