How to Grow Borage
(Borago officinalis) from Seed
The bee magnet with the electric blue stars — one of the very few truly blue flowers in cultivation, edible with a fresh cucumber flavour, the essential companion plant for the vegetable garden, and so prolific a self-seeder it effectively becomes a permanent garden resident
True blue is rarer in the flower world than most people realise. Many plants described as "blue" are in fact violet, lavender, purple, mauve or blue-grey. Borage is one of the few genuinely, unambiguously blue flowers — an electric, almost Mediterranean cobalt-blue that has no purple or grey in it, and that glows with particular intensity in the low light of morning and evening. This is not an accident of breeding but an ancient botanical characteristic of Borago officinalis, a plant that has been cultivated in gardens since Roman times for its flowers, leaves and oil.
Roman soldiers, according to Pliny the Elder, drank wine infused with borage leaves before battle — the plant had a reputation for inducing courage, a connection preserved in the old Latin phrase ego borago gaudia semper ago ("I, borage, always bring courage"). Whether or not this is pharmacologically meaningful, borage's practical value is genuine: it is one of the most effective pollinator plants in any kitchen garden, attracting bees in quantities that measurably improve the set of nearby fruits and vegetables. Grow it near tomatoes, strawberries, courgettes and beans, and the pollination rate of those crops improves. The flowers are also among the most beautiful edible decorations available from any annual plant.
Quick Facts at a Glance
Plant Type
Hardy Annual (H4)
Sowing Time
Apr–Jun direct · Sep for early blooms
Flowering
June – October
Position
Full sun; poor, well-drained soil
Height
60–90cm · sprawling habit
Difficulty Rating
1 out of 5 — Very Easy
Understanding the Plant
Borago officinalis is a member of the Boraginaceae family — the same family as forget-me-nots, comfrey, and lungwort — all of which share the characteristic rough, hairy leaves and the vivid blue flower colour. The plant is native to the Mediterranean and has been cultivated across Europe for at least two thousand years. In Britain it is grown as a hardy annual, though its prolific self-seeding habit means that once established in a garden, it effectively becomes a permanent presence that returns without any intervention each year.
The distinctive cucumber flavour of borage — both leaves and flowers — comes from nonadienal (cucumber aldehyde), the same compound responsible for the characteristic fresh scent of cut cucumber. The flavour is mild and refreshing. The leaves are rough-hairy but can be eaten young and tender; the flowers are completely smooth, delicate, and the best edible part. The taproot that develops makes borage drought-tolerant once established but means it dislikes transplanting — direct sowing is strongly preferred.
Companion Plant Champion
Borage is one of the most effective companion plants available for the kitchen garden. Its flowering season overlaps with the most critical pollination windows of tomatoes, strawberries, courgettes, beans and cucumbers — and the sustained presence of bees working the borage flowers nearby measurably increases the pollination rate of those crops. It is also traditionally said to deter aphids and the tomato hornworm, and to improve the growth and flavour of neighbouring strawberries and tomatoes. Grow it at the edges of vegetable beds rather than among the crops themselves — it reaches 60–90cm and becomes somewhat sprawling. Borage in the kitchen garden earns its space several times over.
Poor Soil Produces Better Flowers
Like Briza, Bunny Tails and Bronze Fennel, borage prefers lean soil. In very rich or heavily fertilised ground, it produces excessive leaf growth and fewer flowers. Average to poor, well-drained soil produces the most flower-laden plants. Do not add compost or fertiliser before sowing — borage is genuinely at its finest when left to do what it evolved to do in stony Mediterranean ground.
Sowing & Establishment
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Direct sow where plants are to grow — do not transplant. Borage develops a taproot that does not survive transplanting from a pot or module. Sow directly into the final position and leave it there. If you must start indoors, use deep biodegradable pots that can be planted out intact.
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Sow from April to June at 1–2cm depth in full sun. Scatter seeds thinly and thin to 30–40cm spacing. Germination is fast — typically seven to fourteen days. Autumn sowing (September) produces larger, earlier-flowering plants the following year but requires some tolerance for slightly straggly overwinting seedlings.
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Allow to self-seed freely in subsequent years. Once borage has flowered and set seed in its first year, it will self-seed into the surrounding soil. These self-seeded plants will emerge in autumn or the following spring, and are invariably stronger and earlier-flowering than fresh-sown spring plants. Mark the area and avoid disturbing the soil where seeds have fallen. Within two to three seasons, a self-sustaining borage colony establishes itself with no further seed purchasing needed.
Growing On & Care
Full Sun for Best Flowering
Full sun produces the most flower-laden plants and the most intensely electric-blue colouration. In partial shade, the plants become taller and more sprawling with fewer flowers. Borage native habitat is open, rocky Mediterranean scrub — maximum sun and minimal competition. Stake or allow to sprawl naturally in a semi-wild kitchen garden area.
Drought Tolerant
The taproot makes established borage very drought-tolerant. Water young seedlings in the first two to three weeks; established plants need no supplementary watering in a normal UK summer. Overwatering in rich soil produces the leaf-heavy, flower-poor plants that represent borage at its least useful.
Self-Seeding Management
Borage self-seeds so freely that it can become a nuisance in a very tidy garden. To manage it: allow plants to set seed in one or two specific areas, then remove spent plants from other locations before seed drops. In a cottage garden or kitchen garden context, the naturalistic self-seeding is a feature — let it colonise the gaps it chooses and remove only where it is inconvenient.
The Ultimate Bee Plant
Borage is on the RHS Plants for Pollinators list, and on a warm summer day a well-established plant can host dozens of bees simultaneously. Bumblebees, honeybees and solitary bees are all regular visitors. The benefit extends beyond the borage itself — sustained bee activity in the area improves pollination rates across the entire kitchen garden.
Handle with Gloves
The leaves and stems of borage are covered in fine, stiff hairs that can cause mild skin irritation in sensitive individuals — similar to the irritation from nettles but milder. Wear gloves when handling large quantities of foliage. The flowers are completely smooth and safe to handle with bare hands.
The Ice Cube Trick
Freeze individual borage flowers into ice cubes for a stunning garnish for summer drinks. The electric blue flower remains vivid when frozen and slowly appears as the ice melts in a glass of Pimm's, gin and tonic, or elderflower cordial. Simply place a single flower face-down into an ice cube tray, cover with water, freeze overnight. An effortless professional-looking result.
Harvesting & Using
The Many Uses of Borage
Edible flowers: Pick individual star-shaped flowers at their freshest and use immediately — they do not last long once picked. Scatter over salads, float on soups and drinks, use to garnish cucumber sandwiches and summer canapés. The mild cucumber flavour complements almost any summery preparation. Pick regularly — regular harvesting encourages the plant to continue producing flowers.
Ice cubes: The finest and most visually impressive use. Freeze individual flowers face-down into ice cubes (see above). The blue colour is exceptional in a glass of sparkling water, white wine, elderflower or a classic Pimm's. Professional-looking and effortless.
Young leaves in salads: The very youngest, smallest leaves — before the hairs have fully developed — have a mild cucumber flavour and can be eaten in salads. Pick only the tender growing tips. Older leaves become too hairy for pleasant raw eating but can be cooked: wilted borage leaves were used in traditional Mediterranean cooking much like spinach.
Infused water and drinks: A handful of borage flowers and leaves steeped in a jug of cold water overnight produces a gently cucumber-flavoured infused water. Combined with mint, lemon and cucumber slices, it makes an elegant non-alcoholic summer drink.
Companion planting note: Position plants within 2–3 metres of tomatoes, courgettes, strawberries and beans for maximum pollination benefit. The precise mechanism is partly direct (bees attracted to borage will work the neighbouring crops) and partly indirect (the sustained bee presence raises overall pollinator activity in the area).
Common Problems & How to Fix Them
| Problem | Likely Cause | What to Do |
|---|---|---|
| Few flowers, lots of leaves | Rich soil; over-feeding; insufficient sun | Grow in lean, unfertilised, well-drained soil. Do not add compost or feed. Move to a sunnier position. Borage in poor soil in full sun produces abundant flowers; in rich soil in shade, it produces primarily large, coarse leaves. |
| Seedlings die after transplanting | Taproot damaged in transplanting | Borage strongly prefers direct sowing. If transplanting is necessary, use very young seedlings with the smallest possible root system, or biodegradable pots planted out intact. Never prick out from a shared tray. |
| Aphid colonies on young growth | Common in May and June on new shoots | Knock off with a jet of water or remove by hand. The sustained bee population around borage also attracts hoverflies — whose larvae eat aphids — providing some natural biological control. On a strongly growing plant, aphid damage is rarely severe. |
| Plant falls over, sprawling habit | Normal for the species; no staking | Borage naturally becomes somewhat sprawling as it matures, particularly in full flower. Allow it to sprawl naturally in informal planting schemes, or stake with a single bamboo cane per plant in tidier gardens. The sprawling stems still produce flowers abundantly — the plant does not need upright support to flower well. |
Plant Specifications
The bee magnet with the electric blue stars that never stops giving
Borage is one of those garden plants that asks almost nothing and gives almost everything — electric blue flowers from June to October, a sustained bee presence that improves the productivity of the entire kitchen garden, edible flowers with a cucumber freshness for salads and drinks, and a self-seeding habit that makes it permanently self-renewing without any ongoing effort. Sow it once in poor soil in a sunny position, let it self-seed, and enjoy a colony that returns year after year without prompting. This is companion planting and edible gardening at its most effortless.
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