How to Grow Borage (Starflower)
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Borage (Starflower)
Borago officinalis
herbBorage is a robust annual herb with hairy stems and distinctive star-shaped blue flowers that attract pollinators. The plant grows 24-36 inches tall and produces edible flowers and leaves with a subtle cucumber-like flavor. Both flowers and foliage are valued in culinary applications, herbal medicine, and as a beneficial companion plant.
When should you plant Borage (Starflower) in your zone?
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Example Borage (Starflower) timeline · Pittsburgh, PA (Zone 6b)
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Plant Borage (Starflower)
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Borage (Starflower)
Around Jun 1≈ 45 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Borage (Starflower) dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 2-10; prefers cooler months in hot climates
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Seedling
2-3 weeksSmall cotyledons emerge, followed by true leaves with visible fuzz. Plants are delicate and tender.
Keep soil moist but not soggy. Thin seedlings to proper spacing once 2-3 inches tall. Protect from strong winds.
Vegetative Growth
2-3 weeksPlants develop multiple hairy stems and numerous deeply-lobed leaves. Rapid growth occurs during this stage.
Reduce watering frequency as soil dries out. Support taller plants with stakes if needed in windy locations. Pinch tips to encourage bushier growth.
Flower Bud Formation
1-2 weeksTerminal clusters of buds form at stem tips. Plant height increases significantly.
Maintain consistent moisture and moderate fertilization. Deadhead lower spent flowers to encourage upper blooming.
Flowering & Bloom
4-6 weeks or until frostDistinctive star-shaped blue (occasionally pink or white) flowers bloom continuously. Flowers are highly attractive to bees and butterflies.
Harvest flowers in the morning for peak crispness. Deadheading extends flowering period. Minimal fertilizer needed; excess nitrogen reduces flavor.
Seed Production & Decline
2-3 weeks until frostFlowers fade and seed pods develop. Plant energy shifts to seed maturation; foliage yellows.
Allow some flowers to set seed for self-seeding next year. Harvest seed pods when they turn brown but before they scatter.
Common Pests
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Hand-pick affected leaves or use neem oil spray. Encourage beneficial insects.
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Improve air circulation, avoid overhead watering. Apply sulfur dust or fungicide if severe.
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Remove and destroy infected plants. Control aphid vectors with insecticidal soap.
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Handpick early morning. Use pheromone traps or neem oil spray.
Uses
Edible Flowers & Salads
CulinaryThe star-shaped blue flowers are edible with a delicate cucumber-like taste and are commonly used as garnish in salads, cocktails, and desserts. Borage flowers add visual appeal and subtle flavor to fresh greens and summer beverages. [source]
Herbal Infusions & Teas
CulinaryFresh or dried borage leaves and flowers can be steeped into refreshing teas believed to have cooling properties. Historically used in traditional beverages and lemonade across Europe. [source]
Borage Seed Oil & Gamma-Linolenic Acid
MedicinalBorage seeds are rich in gamma-linolenic acid (GLA), an omega-6 fatty acid traditionally used in herbalism for immune support and inflammation management. Commercial borage oil supplements are extracted from seeds. [source]
Natural Dye & Honey Production
HouseholdBorage is an excellent bee plant that produces abundant nectar for honeybee forage. Petals can also be used to create natural dyes for textiles. [source]
Pollinator Support
WildlifeThe abundant blue flowers attract bees, butterflies, and other beneficial insects throughout the growing season, making borage an excellent pollinator support plant in any garden. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Harvest flowers early in the morning after dew dries but before peak heat. Pinch off individual flowers or entire clusters. Leaves are best harvested young and tender before flowering; cut from stem tips. Both flowers and leaves can be harvested until frost. Flowers are most prized for their appearance and flavor; use within a day or freeze in ice cubes for later use.
Fun Facts
- 🌱 Borage flowers contain up to 5 times more mineral content than many other herbs, including potassium, calcium, and silica.
- 🌱 The plant's name may derive from the Arabic word 'abu araq' meaning 'father of sweat,' referencing its historical use in herbal remedies.
- 🌱 Borage self-seeds readily and can become semi-permanent in gardens, sometimes volunteering year after year in favorable climates.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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