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Basil

Crop profile

Basil crop profile

A tender, fragrant herb, best grown in warmth and pinched often to keep plants compact.

Italiano

Starting method

Direct sowing or transplanting

Direct soil

24 °C

Transplant soil

24 °C

Night minimum

12 °C

Frost buffer

14 days

Heat stop

35 °C

Harvest

35–60 days

Indoor lead

35 days

Key temperatures

  1. 0
  2. 5
  3. 10
  4. 15
  5. 20
  6. 25
  7. 30
  8. 35
  9. 40 °C
  • Below 24 °CCold risk: slower growth or cold damage.
  • 24 °CMinimum range to start: direct sowing from 24 °C, transplanting from 24 °C.
  • 24–30 °CBest range for growth and production.
  • 30–35 °CPerformance drops and plants move into stress.
  • Above 35 °CPause transplants: heat stress risk.

Basil cycle

  1. 1. Start indoors

    Average time:
    35 days

  2. 2. Direct sowing or transplanting

    Soil: at least 24 °C
    Night minimum: at least 12 °C

  3. 3. Growth

    Ideal temperatures 24–30 °C
    Avoid peaks above 35 °C

  4. 4. Harvest

    First harvest around:
    35–60 days after starting

How to start

  • Recommended method: direct sowing or transplanting.
  • Prepare seedlings with mild, steady temperatures.
  • Start when soil and nights are stable above the crop thresholds.

Temperatures to respect

  • Direct-sowing soil: minimum 24 °C.
  • Transplant soil: minimum 24 °C.
  • Night minimum: minimum 12 °C.
  • Heat stop: 35 °C.
  • Suggested frost buffer: 14 days.

Harvest timing

  • Cycle to first harvest: about 35–60 days.
  • Harvest gradually as produce reaches maturity.

Seasonal notes

  • Protect young plants from late frosts and thermal swings.
  • In summer, avoid water stress and heat peaks above 35 °C.
  • Steady growth improves development and harvest quality.

FAQ and sources

When should you sow or transplant basil?

Basil needs real warmth. For direct sowing, wait until the soil is around 24 °C, nights stay above 12 °C, and at least two weeks have passed since the last frost. More often, it is better to sow indoors about 35 days before transplanting and move plants outside only when the weather is stable. Cold stops growth and can blacken the leaves. In beds or pots, choose morning sun, warmth, and wind protection, while avoiding extreme drought.

Is basil better from seed or from a young plant?

Seed is useful if you want many plants or specific varieties, but it needs steady heat. A young plant is faster and easier, especially on a balcony. If you buy a crowded supermarket-style basil pot, split it into small groups and repot them: packed plants compete and collapse quickly. Do not bury the crown too deeply. After transplanting, keep the compost moist but not waterlogged, and wait a few days before harvesting heavily.

How many days before you can harvest basil?

You can usually start harvesting basil after about 35-60 days, once the plant has enough nodes and leaves. Do not randomly pull single leaves from the base. Pinch the tips just above a pair of leaves to stimulate side shoots and make the plant bushier. Harvest little and often. For pesto and cooking, pick in the morning, when leaves are firm and aromatic. Avoid severe cutting on young or stressed plants.

How do you stop basil from flowering?

Pinch the growing tips regularly before flower buds open. When basil flowers, the plant puts energy into reproduction and the leaves become smaller and tougher. Heat, a small pot, and lack of water all speed up flowering. Keep the plant growing with frequent pinching, fertile compost, and regular watering. To attract useful insects, let one or two dedicated plants flower, but keep pinching the basil you want for the kitchen.

Why does basil turn yellow or black?

Basil turns yellow from too much water, poor nutrition, exhausted compost, or suffocated roots. It often turns black after cold, wind, or sudden temperature swings. Basil is tender: below 12 °C at night it suffers even without frost. Use a draining pot, water when the top layer of compost dries, and do not leave water in the saucer. Pale leaves on an otherwise growing plant may need light feeding. A rotting stem means you have watered too much.

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