Basil

Aromatic and tender. Grows best with warmth: plant alongside tomatoes for a classic combination.

Written by Yemi · Last reviewed August 2026

Waiting this month
First sprouts in 5–10 days

Difficulty

Basil

Out of season right now. The next sowing window opens in March.

Growing Calendar

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sow
Transplant
Harvest

This month: Oct

Plan ahead for this crop

  • •Check growing conditions
  • •Prepare for next stage

Sowing Guide

What you'd find on the seed packet

Sow Depth

Surface sow (press lightly, do not cover)

Spacing

20cm

Germination

5–10days

Thinning

Thin to one strong plant per 20cm

Grower's Note

Needs consistent warmth above 15°C to thrive. Sow indoors Mar–May; do not plant out until nights are reliably warm.

Recommended Varieties

'Salvo' holds an RHS Award of Garden Merit and its neat, upright, compact habit genuinely suits a pot or windowsill. 'Aroma 2' also holds an AGM: it's a vigorous F1 with larger, sweeter leaves, better suited if you want a bigger harvest for pesto. For organic growing, The Organic Gardening Catalogue lists organic-certified 'Genovese' as an open-pollinated alternative to the two F1 hybrids above.

Planting Out Guide

Best spaces, conditions and how to plant out

Plant Spacing

20–25cm

Best Grown In

Containers, sheltered raised beds, sunny patio spots

Conditions

Full sun, warm and sheltered. Rich, free-draining compost. Minimum 15°C nights. Plant out only in settled warm weather.

Grower's Note

Basil hates cold and waterlogged soil. Pinch out flower spikes to keep plants bushy. Grows brilliantly alongside tomatoes.

Growing Stages

Approximate weeks from sowing to harvest

Sprouting

1wks

Establishing

3wks

Maturing

6wks

Total~10 weeksfrom seed to harvest

This week for your basil

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Water

Every 2–3 days

Sunlight

6+ hours direct sun

Watch Out For

Cold temperatures below 10°C cause blackening and collapse: keep indoors until nights are reliably warm and never leave outside on cool evenings

Overwatering causes root rot: allow compost to dry slightly between waterings and use free-draining compost with good drainage holes

Aphids cluster on soft growing tips: pinch out affected tips and spray with a dilute soap solution; check plants weekly

Pests & Problems

Full guide

Aphids

Colonies on growing tips under glass

May–Sep

Slugs

Seedlings destroyed

May–Sep

Downy Mildew

Yellow patches on upper leaves

Jun–Sep

What You'll Need

Equipment for growing basil

Modular Seed Tray

96-cell for precision sowing

Fine Rose Watering Can

Gentle shower for seedlings

Bamboo Canes

Pack of 20 × 120cm

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Common Questions

About growing Basil in the UK

When can I put basil outside in the UK?

Basil can go outside from late May to June, once nights are reliably above 10°C and there is no frost risk. Even then, a warm, sheltered, south-facing spot is essential. Bring plants in if temperatures drop unexpectedly.

Why does my basil keep dying?

The most common causes are cold temperatures, overwatering, and poor drainage. Basil hates cold roots, wet soil, and draughts. Ensure pots drain freely, water only when the top of the compost feels dry, and keep out of cold draughts.

How do I stop basil going to seed?

Pinch out flower spikes as soon as they appear. Once a basil plant flowers and sets seed, leaf production slows and flavour decreases. Pinching out every week or two keeps plants bushy and productive throughout summer.

Is supermarket basil the same as garden basil?

Supermarket basil is grown in overcrowded conditions under stress: it is not the same as a well-established garden plant. Separate the plants, repot individually into good compost, and grow in good light for a much longer-lasting, more productive plant.

Written from real growing experience, organic methods only. Our story · Our approach

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