Borage

Borago officinalis

Family Boraginaceae

Annual annualZones 2-11

Botanical illustration of Borage

Borage flowers are perfect blue stars with a clean cucumber taste — the prettiest drink garnish a garden makes, floated on gin or frozen into ice cubes. A garnish plant, though, not a salad green: a few blossoms are the right dose of its charm.

Bees choose borage over nearly everything else in bloom — a sprawling two-to-three-foot annual that permaculture growers run as living mulch under fruit trees. Sow it once and it returns on its own forever. Set some at the orchard's feet and listen to it hum.

Where to buy borage — 5 nurseries compared

  • Full Sun
  • Low water
  • Fast growth
  • Attracts bees
  • None winter chill
Borage — a print from the Plant Library collection

From the print shop

Growing borage? Hang it.

Our Plant Library collection carries borage — Borago officinalis, print Nº 68, “Borage.”

526 designsfrom $12.99white or black backgroundmatte poster, unframed

Shop Plant Library botanical prints →

✓

Will it fruit where you are?

Enter your ZIP — we look up your USDA hardiness zone (2023 map) and check it against what borage actually needs.

Life cycleAnnual
Winter chillNone

Borage · Common problems

Common borage problems

Pests, diseases and weather to keep an eye on.

Pests

1 problem on file

  • Almost none — it's a pest DECOY for tomatoes

Diseases

1 problem on file

Borage · Growing & propagation

Growing borage

Light, water, soil, propagation and the season’s jobs.
What it needsThe details
Light
Full Sun
Water
Low
Soil
Any

Thrives in poor soil · pH 6.0 - 7.0

Fertilizer
None
Pruning
None

Chop-and-drop spent plants as mulch; it self-sows for next year.

Spacing
12-18 in

How to plant & propagate borage

Maturity
55-75 days
From seed
Direct-sow after frost

Self-sows freely

Propagate
From seed

Borage · Seasonal care & spray guidance

The borage growing playbook

Field-tested instructions for every job borage asks of you, compiled from university extension guidance — in the order the season brings them.

As growth begins

early spring

2 jobs
SowingIn spring

Direct sow in place once frost danger has passed

Sow borage seed right where it will grow, about a quarter inch deep, after your last frost and once the soil has warmed. Pick a full-sun spot with good drainage; borage is unfussy about soil fertility and will do fine on poor ground. Do not start it in cells and move it out later. Borage sends down a taproot early and resents being lifted, so seedlings started in pots transplant badly and sulk. Seed sown in place skips the check and catches up to a transplant within weeks.

ThinningIn spring

Thin seedlings to a foot apart

Once seedlings are up and handling well, thin them to stand about 12 inches apart, with roughly 18 inches between rows. Pull the extras rather than cutting around the keepers. A borage plant fills out to two or three feet of coarse, hairy foliage, and crowded plants trap still, humid air between them. That stagnant air is what lets powdery mildew take hold on a plant that otherwise has almost no disease problems.

While it flowers

at bloom

2 jobs
PruningAt bloom

Deadhead to keep bloom coming and volunteers down

Snip spent flower heads off any plants you do not want reseeding themselves. Leave a few heads to set seed if you want borage back next year - one or two plants will supply plenty. Borage is a prolific self-sower and will carpet a bed with volunteers if every head is allowed to ripen. Cutting heads before the seed drops also pushes the plant to keep flowering rather than shutting down once it has set seed.

HarvestingAt bloom

Pick blossoms as they open and leaves while young

Pick the star-shaped blossoms as each one opens, and take leaves fresh while they are still young and soft - morning, once the dew has dried but before the sun gets hot, is the best time and retains the most flavor. Use both fresh; borage is seldom worth drying because the cucumber flavor does not survive it. Flowers are only good for a day or two once open, and the plant keeps throwing new ones as long as you keep picking. Leaves toughen and grow bristlier with age, so the eating window on any given leaf is short.

Through summer

the growing season

2 jobs
SowingIn summer

Sow again every four weeks for tender leaves

If you want borage leaves for the kitchen rather than just flowers for the bees, make successive sowings about four weeks apart through the growing season - three plantings is a good target. Only young borage leaves are worth eating; as a plant ages its foliage coarsens and the bristles stiffen until the leaves are unpleasant raw. A fresh batch of plants coming on every month keeps tender growth in supply instead of one aging stand.

ProtectionIn summer

Stake plants before they get top-heavy

As plants approach their full two to three feet, give them a stake or a ring support, especially in an exposed or windy site. Borage stems are hollow and brittle rather than woody, and a tall plant loaded with flowers snaps or splays in wind instead of bending with it. A broken main stem ends that plant's bloom for the season.

Borage · Companion plants

Borage companion plants

Good companions

Underlined names have their own growing guide in this library.

Borage · Calculators & field guides

A little help in the garden.

Calculators for the figures. Field guides for the hands-on work.

Borage · Yearly calendar

The borage year, month by month

What borage asks for, month by month.

Jan

No calendar activity is listed for this month.

MonthJanFebMarAprMayJunJulAugSepOctNovDec
Bloom

BloomJune

What each band means

  • Bloom — flowers open — pollinators working, frost on blossoms is the danger.

These are the species' typical months — expect them a few weeks earlier in warm zones and later in cold ones. Watch the plant, not just the calendar.

Borage · Ecology & uses

Ecology & uses

What it does for the garden, and what it is grown for.
Botanical illustration of Borage

Borago officinalis

Borage in the garden system

  • Herbaceous layer annual
  • Dynamic accumulator
  • Nectary/insectary
Attracts
Bees
Moisture
Upland / dry
Deer
Browsed

Protect young plants

Origin
Introduced

What borage is grown for

✓ Commonly eatenSafe in small culinary amounts only — leaves and flowers contain hepatotoxic pyrrolizidine alkaloids, so it is not a bulk salad green and not for regular or long-term use. ASPCA lists borage toxic to dogs, cats and horses.

Use
Bee forage
Use
Drink garnish
Use
Companion plant
Edible value
3/5

Harvesting & storing borage

Flowers + young leaves (cucumber flavor). About 55-75 days from planting.

Edibility, identification, and traditional-use notes here are general reference — not medical or veterinary advice, and not a claim that any plant treats or prevents anything. Medicinal ratings record how strongly a plant features in herbal tradition, nothing more. Never eat or dose a plant you have not positively identified. More on how to use this library.

Borage · Varieties & cultivars

Choosing a borage variety

Match the plant to your climate, season and available space.

'Alba' (white); standard blue

Sources & plant identity

Know what you’re growing.
See where the knowledge comes from.

Botanical illustration of Borage

Borage

Borago officinalis

The plant, at a glance.

Botanical name
Borago officinalis
Plant family
Boraginaceae
Growth habit
Annual
Origin
Introduced
USDA plant symbol
BOOF
Invasive risk
Low
Every garden is different.

Hardiness, size and timing vary with your cultivar, soil and climate.

Rooted in research.

University extension research, brought together with hands-on growing experience at Story Thyme Farms.

Explore Borage’s sources4 reference links
for Borage

Research from these sources

Publisher marks identify sources, not sponsorship or endorsement.

Questions

Borage questions, answered straight.

Is borage safe for kids and pets?

Borage is commonly eaten and isn't considered toxic, but "commonly eaten" isn't a guarantee for any particular person or animal — allergies, quantity, and which part you eat all matter. One caveat on this one: Safe in small culinary amounts only — leaves and flowers contain hepatotoxic pyrrolizidine alkaloids, so it is not a bulk salad green and not for regular or long-term use. ASPCA lists borage toxic to dogs, cats and horses. Never eat a plant you haven't positively identified, and check with a vet before letting pets or livestock graze anything new.

When do you harvest borage?

Flowers + young leaves (cucumber flavor). From planting, expect about 55-75 days to maturity.

What grows well with borage?

Proven companions include tomatoes, strawberries, squash — deters hornworms — the full companion list, and what to keep away, is in the Growing tab above.

How do you propagate borage?

From seed.

Elsewhere

Where borage sits in the library.

Where borage sits in the library

Grows in the same world