Borage

The hardest-working companion plant in the garden. Borage attracts pollinators, deters tomato hornworm, and its blue flowers are edible. Sow it once and it will return every year.

Written by Yemi · Last reviewed August 2026

Waiting this month
First sprouts in 5–10 days

Difficulty

Borage

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

1cm

Spacing

30cm

Germination

5–10days

Thinning

Thin to one plant per 30cm: remove weaker seedlings at ground level rather than pulling to avoid disturbing the taproot

Grower's Note

Direct sow only. Borage genuinely improves the performance of nearby crops: particularly strawberries and tomatoes. Self-seeds freely, so one packet of seed is usually all you'll ever need to buy.

Recommended Varieties

The straight species, Borago officinalis, is the standard choice for pollinators and a Pimm's garnish, and self-seeds freely once established. 'Alba' has the same hardy, bushy habit but pure white flowers, worth choosing for a paler colour scheme. Neither holds an RHS AGM.

Growing Stages

Approximate weeks from sowing to harvest

Sprouting

1wks

Establishing

4wks

Maturing

6wks

Total~11 weeksfrom seed to harvest

This week for your borage

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Water

Every 3–4 days

Sunlight

6+ hours direct sun

Watch Out For

Borage grows large quickly (up to 90cm tall and wide): give it room or it will crowd out smaller companion plants nearby

Prolific self-seeding can become a nuisance: deadhead spent flowers if you do not want it spreading across the bed

Aphids cluster on new growth tips in summer: these usually attract ladybirds within days; leave them unless the infestation is severe

Pests & Problems

Full guide

Aphids

Colonies on young growth

May–Aug

What You'll Need

Equipment for growing borage

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Common Questions

About growing Borage in the UK

When do I sow borage in the UK?

Sow borage directly outside from April to June. It germinates quickly in warm soil (within 1–2 weeks) and dislikes transplanting. Once established, it self-seeds freely and will appear in the garden year after year without resowing.

Are borage flowers edible?

Yes, the vivid blue star-shaped flowers are fully edible with a subtle cucumber flavour. They are excellent in salads, frozen in ice cubes, as cake decorations, or floated in summer drinks. Leaves are also edible but hairy: chop finely or use in cooked dishes.

Does borage attract bees?

Yes, borage is one of the most valuable pollinator plants available. A single plant in flower produces hundreds of nectar-rich blooms over several months. Planting borage near cucumbers, courgettes, strawberries, and squash significantly improves pollination and yield.

Does borage spread?

Borage self-seeds prolifically: once established in a garden, it will return every year from self-sown seeds. It is not aggressive but will pop up in unexpected places. Simply remove plants where they are not wanted; transplant when very young as they dislike root disturbance.

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

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