Basils in Overton

Ocimum basilicum

Basil
Basil · Ocimum basilicum

Basil is a fragrant, tender herb whose leaves are a staple of summer cooking. Native to tropical regions, basil is treated as an annual in temperate climates like the UK because it cannot tolerate frost. It thrives in warm, sunny conditions and can be grown in garden beds or pots for a steady supply of fresh, flavourful leaves throughout the summer.

60 cm · Full Sun · Moderate Water

Calibrated to Overton · last frost ≈ 21 May

Sow indoors April, plant out June, harvest July to October. Frost risk October to May.
ActivityJanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember
Sow indoorsNoNoNoYesNoNoNoNoNoNoNoNo
Plant outNoNoNoNoNoYesNoNoNoNoNoNo
HarvestNoNoNoNoNoNoYesYesYesYesNoNo

Growing guide

Step-by-step instructions for growing Basil

Growing guide for

Change the guide to see different planting timelines and tips.

Step-by-step guide to growing basil by starting seeds indoors and transplanting outside after the last frost.

  1. 01

    Sow Seeds Indoors

    9 Apr to 23 Apr

    Sow basil seeds thinly on the surface of moist seed compost in trays or pots. Cover lightly with vermiculite or a fine layer of compost, as they need some light to germinate. Keep at in a bright spot. Germination takes 7-14 days. Do this 9th April - 23rd April.

  2. 02

    Prick Out Seedlings

    7 May to 14 May

    Once seedlings have their first true leaves, prick them out into individual pots filled with multi-purpose compost. Handle gently by the leaves to avoid stem damage. Keep in a warm, bright location. This step occurs around 7th May - 14th May.

  3. 03

    Pot On Seedlings

    21 May to 28 May

    When roots fill the small pots, pot on into larger containers (e.g., pots) to encourage strong growth before transplanting outdoors. Use a well-draining compost mix. This is done 21st May - 28th May.

  4. 04

    Harden Off Plants

    7 May to 21 May

    Gradually acclimate plants to outdoor conditions over 7-10 days before transplanting. Start by placing them outside in a sheltered spot for a few hours each day, increasing exposure. Protect from strong winds and cold nights. Harden off 7th May - 21st May.

  5. 05

    Transplant Outdoors

    4 Jun to 18 Jun

    Plant basil outdoors in a sunny, sheltered spot with well-drained soil after all risk of frost has passed. Space plants apart. Water in well and consider using cloches or fleece if nights are cool. Transplant 4th June - 18th June.

  6. 06

    Water and Feed Plants

    25 Jun to 22 Oct every 2 weeks

    Water basil regularly to keep the soil consistently moist but not waterlogged. Feed every 2-3 weeks with a balanced liquid fertiliser to support leafy growth. Start feeding from 25th June and continue until 22nd October.

  7. 07

    Pinch Out and Prune

    2 Jul to 22 Oct

    Regularly pinch out the growing tips and any flower buds to encourage bushy growth and prevent bolting. Harvest leaves from the top down, taking no more than one-third of the plant at a time. Do this from 2nd July onwards.

  8. 08

    Harvest Leaves

    26 Jul to 22 Oct

    Harvest basil leaves regularly once plants are well-established. Pick in the morning for the best flavour, using scissors or pinching off stems above a leaf pair. Harvest from 26th July until 22nd October for continuous supply.

Companion plants

Tap a plant to see why it works (or doesn't) with Basil.

Good companions

Plants to avoid

Why companion planting matters

Companion planting can deter pests, improve pollination, and make better use of space. Some plants confuse pests or attract beneficial insects; others improve soil or offer shade to neighbours that need it.

Suggested varieties

Popular varieties of Basil to consider

Sweet Basil

The classic variety with large, aromatic green leaves, ideal for pesto and Italian dishes.

Greek Basil

A compact, bushy variety with small leaves, perfect for container growing and slower to bolt.

Purple Basil

Adds colour to the garden with deep purple leaves and a slightly stronger flavour, great for garnishes.

Basil guides by town

See how Basil timing shifts in other towns with different frost dates.