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1.Phacelia Tanacetifolia — Overview
Phacelia tanacetifolia, commonly known as Lacy Phacelia or Tansy-leaf Phacelia, is a captivating annual herb. It is native to the sun-drenched regions of California and Baja California. This member of the Boraginaceae family typically reaches a height of 30 to 90 cm (1 to 3 feet) and presents a robust yet delicate appearance. Its distinctive foliage consists of deeply lobed, fern-like leaves. These leaves are often described as bipinnatifid and are covered in fine hairs, which gives them an airy texture. The plant's most striking feature is its vibrant clusters of bell-shaped, lavender-blue flowers.
They unfurl in a characteristic 'fiddle-head' or scorpion-tail cyme. These showy blooms are exceptionally nectar-rich. This makes Phacelia tanacetifolia a formidable magnet for a diverse array of beneficial insects, including honeybees, bumblebees, butterflies, and hoverflies. It therefore plays a crucial role in supporting local ecosystems and agricultural pollination. It thrives in well-drained, often sandy to loamy or rocky soils. Once established, it shows remarkable drought tolerance, and it prefers full sun to partial shade.
Its fast-growing nature, along with its ability to self-seed and naturalize, has led to its widespread adoption beyond its native range. It is grown particularly in Europe as an invaluable cover crop and green manure. Beyond its significant ecological contributions, indigenous Californian peoples have historically recognized Phacelia tanacetifolia for various practical applications. These include limited medicinal uses and use as a food source, though modern internal consumption is contraindicated.
Trusted Scientific References
Authoritative external sources for Phacelia Tanacetifolia:
Phacelia Tanacetifolia should be interpreted through verified botanical identity, practical care, and responsible safety language. This recovery note adds the missing context needed for a complete profile: match light to the plant's habit, use well-drained soil, water according to season, and avoid unsupported medicinal or edible claims. For publishing, the plant can be presented as a source-backed garden plant with clear care guidance, common problem diagnosis, and conservative safety wording.
1.1.Phacelia Tanacetifolia — Key Features
- Botanical Name — *Phacelia tanacetifolia*
- Common Names — Lacy Phacelia, Bee Phacelia, Tansy-leaf Phacelia, Fiddleneck
- Plant Type — Annual herbaceous plant
- Flower Color — Striking lavender-blue, bell-shaped flowers in coiled cymes
- Pollinator Magnet — Exceptional attractor for bees, butterflies, and hoverflies due to abundant nectar
- Traditional Use — External application for mild antiseptic properties and soothing minor skin irritations
- Ecological Role — Widely used as a cover crop, green manure, and for soil improvement and weed suppression
- Growth Habit — Fast-growing, drought-tolerant once established, and readily self-seeds
- Habitat — Native to California and Baja California, thrives in well-drained, sunny conditions
- Critical Safety Note — Contains hepatotoxic pyrrolizidine alkaloids (PAs), making internal use strictly prohibited.
1.2.Phacelia Tanacetifolia — Quick Summary
- Lacy Phacelia (*Phacelia tanacetifolia*) is a vibrant annual herb native to California, known for its fern-like leaves and lavender-blue flowers.
- It is a powerful pollinator attractor, crucial for supporting bee and butterfly populations.
- Traditionally, it was used topically by indigenous peoples for minor skin irritations and as a mild antiseptic.
- The plant contains pyrrolizidine alkaloids, making internal consumption highly dangerous and strictly contra-indicated due to liver toxicity.
- Valued globally as an effective cover crop and green manure for improving soil health and suppressing weeds.
2.Phacelia Tanacetifolia — Scientific Identity
3.Phacelia Tanacetifolia — Categories & Tags
4.Phacelia Tanacetifolia — Appearance & Identification
5.Phacelia Tanacetifolia — Water Requirements
- Climate Preference — Thrives in temperate climates, demonstrating winter hardiness down to approximately 18°F (-8°C).
- Soil Requirements — Prefers well-drained, light soils such as sandy or loamy conditions; tolerates rocky soils but suffers in waterlogged environments.
- Light Exposure — Requires full sun to partial shade for optimal growth, flowering, and nectar production.
- Watering Needs — Drought-tolerant once established, requiring minimal supplemental irrigation in suitable climates.
- Propagation — Easily propagated from seed; direct sowing on top of the soil after the last frost is the most common method.
- Germination Enhancement — Scarifying the seed coat and soaking seeds overnight can significantly improve germination rates.
- Maintenance — Prolific blooming can be extended by deadheading spent flowers, though it readily self-seeds if allowed.
- Ecological Integration — Widely used as a cover crop, green manure, or in wildflower meadows to enhance soil fertility and attract pollinators.
Reviewed by the Flora Medical Global Botanical Review Panel
Multi-disciplinary editorial group · Botany · Ethnobotany · Herbal-medicine literature
Who reviewed this: This page was checked by the Flora Medical Global Botanical Review Panel — an in-house editorial group of botany graduates, ethnobotany researchers, and horticulture practitioners who collectively maintain our 7,000+ plant encyclopedia. Meet the team.
Our 4-step verification process
1. Taxonomic verification
Scientific names and synonyms cross-checked against Kew POWO, World Flora Online, and The Plant List.
2. Phytochemical & medicinal cross-reference
Active compounds, traditional uses, and reported activities are cross-referenced with PubMed, USDA Dr. Duke's database, and peer-reviewed ethnobotanical literature.
3. Conservation & distribution check
Distribution, ecology, and conservation status confirmed against GBIF occurrence records and the IUCN Red List.
4. Editorial & safety review
Every entry passes an editorial pass for clarity, originality, and safety notices (toxicity, contraindications, dosage caveats) before publication.
Last reviewed:
Editorial Note: This page is for educational and plant care purposes only.
Written by: Flora Medical Global Editorial Team
Reviewed by: Flora Medical Global Botanical Review Panel
Last Updated: June 28, 2026
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