Borage Christian Orlandi / CC BY-SA 4.0
herb

Borage

Borago officinalis

EdibleMedicinalDrought Tolerant
Edible Partsleaves, flowers

Overview

A cheerful herb with brilliant blue star-shaped flowers that taste like cucumber, borage has been called the herb of courage since Roman soldiers ate it before battle. Its drooping clusters of flowers are among the best bee plants in the garden, producing copious nectar throughout the growing season. Every part of the plant is useful — leaves, flowers, and oil-rich seeds.

Borage (Borago officinalis) is a delightful addition to any garden, known for its vibrant blue flowers that bloom from early summer through fall. This annual herb is native to the Mediterranean region but has naturalized in many other parts of the world due to its hardiness and ease of cultivation.

Appearance and Distinguishing Features

Borage boasts bright blue flowers with a white star-like center, giving it the nickname "starflower." The plant's leaves are slightly serrated, resembling a smaller version of marijuana leaves. Borage can grow quite tall, reaching up to 3 feet in height, and its stems are covered in fine hairs that give them a fuzzy texture.

Native Range and Habitat

Originally hailing from the Mediterranean region, borage thrives in temperate climates with warm summers. It prefers well-drained soil and full sun exposure but can tolerate some shade.

Growing Conditions and Care

Borage is relatively low maintenance and highly adaptable. It grows best in full sun but can tolerate partial shade. The plant requires well-drained soil and does not like to sit in waterlogged soil, which can lead to root rot. Borage is a heavy feeder and needs plenty of nutrients from the soil. If growing organically, compost or organic fertilizer can be added before planting.

Propagation is straightforward; borage seeds germinate easily, and young plants can be started indoors 4-6 weeks before the last frost date. Once the danger of frost has passed, transplant them outdoors. Borage also propagates through self-seeding, as it readily drops seeds wherever its flowers have been.

Uses

Edible: Young leaves and flowers are edible, with a mild cucumber-like flavor. They can be added to salads or used to garnish drinks. The leaves are best harvested when the plant is young and before flowering. Older leaves tend to become bitter. Flowers can also be crystallized for decorating cakes and pastries.

Medicinal

Borage has been traditionally used to treat a variety of ailments, including depression, coughs, and heart disorders. However, due to its content of small amounts of pyrrolizidine alkaloids, it should only be consumed in moderation or under the guidance of a healthcare professional.

Ornamental

Borage is a popular choice for herb gardens or edible landscaping. Its vibrant blue flowers and unique foliage add an interesting visual contrast to other plants. Borage also attracts pollinators like bees and butterflies to your garden, making it valuable in ecological settings.

Ecological

Borage self-seeds readily and can become invasive in some climates, where it may be considered a weed. In more controlled gardening situations, its ability to reseed itself makes it an excellent choice for naturalizing or adding interest over time.

Cultural or Historical Significance

Borage has been cultivated since ancient times and was known as "honey plant" due to its ability to attract bees, which would then produce high quality honey. In folklore medicine, borage tea was believed to provide courage (thus its Latin name, 'officialis') for warriors going into battle.

Notable Varieties or Related Species

While most gardeners will find the blue-flowered variety (Borago officinalis) to be sufficient, there is a white-flowered form available, though it's not as common. Other members of the Boraginaceae family include forget-me-nots (Myosotis spp.), lungworts (Pulmonaria spp.), and Virginia borage (Borago laevis), which differs slightly in leaf shape and flower coloration.

Growing Conditions

LightFull Sun
MoistureDry
Hardiness Zones3 — 10
Height0.6m
Spread0.4m
Growth HabitForb/herb
LifespanAnnual
Bloom Colorblue
Pollinator Valuehigh
Bird ValueWildlife food
Wildlife Valuebees, butterflies

Habitat & Range

Habitat
Meadows & Open Areas
Cultivation Region
Northern temperate regions

Botanical data via projectGAIA.

Companion Planting & Soil

Good Companions

TomatoSquashStrawberryCabbage
Soil pH6 — 7
Soil TypeAverage, well-drained soil; tolerates poor soils

Sowing & Propagation

Planting Depth5.08 cm
Seed Spacing30 cm
Row Spacing30 cm

Propagation Methods

seedself-seeding

Planting Calendar

When to sow, transplant, and harvest by growing zone.

ZoneActionMonthsNotes
Cold (1-2) Direct Sow May — Jun Direct sow after last frost; does not transplant well due to taproot
Cold (1-2) Harvest Jun — Aug Harvest young leaves and blue star-shaped flowers; cucumber flavor
Cool (3-4) Direct Sow Apr — Jun Direct sow in spring; self-sows prolifically
Cool (3-4) Harvest May — Sep Pick flowers for salads; leaves best when young
Moderate (5-7) Direct Sow Mar — May Sow in spring; excellent bee plant and companion for tomatoes
Moderate (5-7) Harvest Apr — Oct Harvest flowers and young leaves continuously
Warm (8-9) Direct Sow Feb — Mar Sow in late winter/spring
Warm (8-9) Direct Sow Sep — Oct Fall sowing for mild winter gardens
Warm (8-9) Harvest Mar — May Harvest before summer heat
Warm (8-9) Harvest Oct — Dec Fall harvest
Hot (10+) Direct Sow Oct — Nov Fall sow; grows through cool season
Hot (10+) Harvest Nov — Mar (wraps) Harvest during cool season

Uses

Culinary

  • Flowers frozen in ice cubes for cocktails and punches
  • Young leaves added to salads for cucumber flavor
  • Flowers candied as cake and dessert decorations

Medicinal

  • Seed oil rich in gamma-linolenic acid (GLA) for skin health
  • Traditional adrenal tonic for stress and exhaustion
  • Leaf tea used as a cooling febrifuge

Other Uses

  • Top-tier bee and pollinator plant
  • Dynamic nutrient accumulator for compost
  • Companion plant that deters tomato hornworm

Safety Notes

Contains pyrrolizidine alkaloids; eat flowers only in small amounts. Avoid regular leaf consumption.