Borage

Borage (Borago officinalis) is worth growing for two practical reasons: the star-shaped blue flowers are edible and command $6-10/lb at specialty retailers and farmers markets (USDA AMS Specialty Crop Market News, 2023), and the plant self-sows so aggressively that you buy seed once and essentially never again. The third reason - it genuinely attracts pollinators, and more pollinators near your tomatoes and cucumbers means better fruit set - is a bonus that’s documented rather than speculative.

What it actually is

Borage is a hardy annual in the borage family (Boraginaceae) native to the Mediterranean region. It grows quickly to 18-36 inches tall with a sprawling, branching habit. The leaves and stems are covered with stiff white hairs that are mildly irritating to sensitive skin - wear gloves when harvesting large quantities. The flowers are five-petaled, star-shaped, and an intense blue (occasionally white or pink) with a distinctive black center cone. Flavor of both flowers and young leaves is distinctly cucumber-like with a hint of honey.

The entire plant is used culinarily: young leaves in salads, flowers as edible garnishes, and flowers floated in drinks or frozen in ice cubes. The flavor dissipates at high heat, so borage is best used fresh or added at the last moment.

The ROI case

Fresh edible borage flowers retail at $6-10/lb at specialty grocers and upscale markets (USDA AMS Specialty Crop Market News, 2023). Farmers markets and direct restaurant sales can push that to $12-15/lb for cleaned, fresh-picked flowers. A standard direct-sown planting from a $1.99 packet produces enough flowers to exceed seed cost in the first season with even minimal harvesting.

The real financial angle is the self-seeding habit. Borage drops seed prolifically throughout late summer and fall. Those seeds germinate the following spring with no intervention - often before you’ve planted anything else. Once you have borage in a bed, you have it indefinitely at no recurring cost. The $1.99 seed packet is effectively a one-time lifetime purchase.

Growing requirements

Borage prefers well-drained soil at pH 6.0-7.0 and tolerates poor, sandy soils that would stress other herbs. Overly rich soil produces abundant foliage at the expense of flowers - avoid heavy nitrogen amendments if flower production is your goal.

Direct sow after last frost - borage doesn’t transplant well due to a long taproot that resents disturbance. Plant seeds 0.5 inch deep, 12 inches apart. Germination in 7-14 days at soil temperatures of 60-70°F. Thin to 18-24 inches for best branching and airflow.

Water at 1 inch per week during establishment. Once the plant is established (3-4 weeks), it handles dry spells without much stress. In hot summers, some shade during the hottest part of the afternoon extends the harvest season - full sun all day causes plants to bolt and flower more intensely but with a shorter productive window.

Borage grows fast enough that successive sowings 3-4 weeks apart extend your harvest through the season. In zones 6+, fall-direct-sown plants often overwinter and are first to produce the following spring.

What goes wrong

Borage has minimal pest problems. The hairy, slightly rough texture of leaves deters most soft-bodied insects.

Aphids (Myzus persicae and related species) occasionally colonize new growth in cool weather. A hard blast of water removes most colonies. Borage’s resilience means aphid pressure rarely affects overall production.

Powdery mildew (Erysiphe boraginacearum) appears on older leaves in humid, late-summer conditions. This is common on mature plants and is primarily cosmetic rather than harmful. Remove affected leaves and improve airflow. By the time powdery mildew appears in earnest, the plant has usually been producing for months.

Cucumber mosaic virus (transmitted by aphids) can cause mosaic discoloration, leaf distortion, and reduced vigor. Remove and dispose of infected plants. Control aphid populations to reduce transmission.

The main management issue with borage is not pest damage but invasiveness from self-seeding. If you don’t want it spreading throughout your garden, deadhead regularly before pods ripen and drop seed. The stems are hollow and easy to pull if volunteer seedlings appear in unwanted locations.

Harvest and storage

Harvest flowers in the morning when they have just fully opened. Gently hold the stem and use small scissors or pinch the flower off at its base. Flowers used for garnishes last 2-4 hours at room temperature; refrigerate in a single layer between damp paper towels for up to 24 hours. They do not dry well - the color fades and texture deteriorates.

Young leaves (the first few inches of growth) are milder and less hairy than mature foliage. Harvest these while the plant is still under 8 inches tall for the best salad use. Mature leaves are coarser and better suited to cooking.

Regular flower harvest encourages continued production and delays plant senescence. A well-harvested borage plant in a reasonable climate produces flowers for 6-10 weeks.

---

Related crops: Tomato, Cucumber

Related reading: Companion Planting Basics - what the evidence actually says about common pairings including edible flowers and pollinators