Basils in Pen-onn

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 Pen-onn · last frost ≈ 24 Apr

Sow indoors March, plant out May, harvest June to November. Frost risk November to April.
ActivityJanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember
Sow indoorsNoNoYesNoNoNoNoNoNoNoNoNo
Plant outNoNoNoNoYesNoNoNoNoNoNoNo
HarvestNoNoNoNoNoYesYesYesYesYesYesNo

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

    13 Mar to 27 Mar

    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 13th March - 27th March.

  2. 02

    Prick Out Seedlings

    10 Apr to 17 Apr

    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 10th April - 17th April.

  3. 03

    Pot On Seedlings

    24 Apr to 1 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 24th April - 1st May.

  4. 04

    Harden Off Plants

    10 Apr to 24 Apr

    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 10th April - 24th April.

  5. 05

    Transplant Outdoors

    8 May to 22 May

    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 8th May - 22nd May.

  6. 06

    Water and Feed Plants

    29 May to 2 Nov 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 29th May and continue until 2nd November.

  7. 07

    Pinch Out and Prune

    5 Jun to 2 Nov

    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 5th June onwards.

  8. 08

    Harvest Leaves

    29 Jun to 2 Nov

    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 29th June until 2nd November 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.