Barrier 15 Phacelia
layout: base.njk title: "Phacelia" plantName: "Phacelia tanacetifolia" category: "Barrier Hedge & Support Species" description: "Growing guide for Phacelia in West Virginia Zone 6b/7a" tags: planting-guide
Type: Annual
Family: Hydrophyllaceae (Waterleaf family)
Sun: Full sun to partial shade
Water: Low to moderate; drought tolerant once established
Soil pH: 5.5-8.0 (adaptable; tolerates poor, alkaline, clay soils)
Hardiness: Annual (zones 2-11)
Growth Rate: Fast (blooms 45-60 days from seed)
Mature Size: 1-3 ft tall × 1-2 ft spread
⚠️ NATIVE STATUS
⚠️ INTRODUCED (WESTERN US) — NOT INVASIVE
Phacelia tanacetifolia is native to the western United States (California, Arizona, Nevada). Introduced to eastern US as cover crop, pollinator plant. NOT invasive in West Virginia.
Status in North America: Widely used as cover crop, green manure, pollinator plant in eastern US. Self-sows but not aggressive. Not listed as invasive.
Management: None needed. Annual (dies with frost). Let some plants seed for next year.
Native alternatives (for WV): Virginia waterleaf (Hydrophyllum virginianum), other native Phacelia species (P. dubia - smallflower phacelia, native to eastern US)
📅 Planting Calendar (WV Zone 6b/7a)
| Activity | Timing | Notes |
|---|---|---|
| Direct sow seeds | March-April (as soon as soil workable) OR August-September (fall cover crop) | Cool season annual |
| Succession plant | Every 3-4 weeks until July | Continuous bloom |
| Fall planting | August-September | Overwinters as rosette, blooms early spring |
| Incorporate as green manure | At flowering (before seed set) | Peak biomass, nitrogen |
| Collect seeds | June-September | When seed capsules dry |
🌾 Varieties / Related Species
Phacelia tanacetifolia (Lacy Phacelia, Fiddleneck)
- Source: Cover crop suppliers, seed companies, native plant nurseries
- Notes: Most common species. Lacy, fern-like foliage. Lavender-blue flower clusters. Exceptional bee plant.
Phacelia dubia (Smallflower Phacelia)
- Source: Native plant nurseries
- Notes: NATIVE to eastern US including WV. Smaller flowers (yellow). Spring annual. Good native alternative.
Phacelia bipinnatifida (Purple Phacelia)
- Source: Native plant nurseries
- Notes: Native to central US. Purple flowers. Perennial/biennial.
'Angel Wings'
- Source: Seed companies
- Notes: Selected variety. White flowers. Ornamental.
📜 Cultural History & Native Range
Native Range (P. tanacetifolia): Western United States (California, Arizona, Nevada, Utah). Grows wild in desert washes, disturbed areas, chaparral.
Introduction to Eastern US: 1900s. Introduced as cover crop, green manure, pollinator plant.
Indigenous Use: - Western Native American tribes: Seeds eaten as grain, medicinal uses - Limited documentation
Historical Applications: - Cover crop: European agriculture (especially vineyards, orchards) - Green manure: Plowed under to improve soil - Bee forage: Recognized as exceptional honey plant - Honey production: European beekeepers plant for honey crop
Ecological Role: - Nectar and pollen for pollinators (exceptional) - Cover crop (suppresses weeds, prevents erosion) - Green manure (adds organic matter, nitrogen) - Self-sows in favorable conditions - Cool season annual (blooms spring/early summer, fall)
Cultural Significance: - European cover crop staple (vineyards, orchards) - Beekeeper's secret weapon (honey plant) - Modern permaculture: Cover crop, pollinator plant, green manure - Organic farming: Weed suppression, soil improvement
🌿 Farm Functions
Primary Functions: - Pollinator magnet: ONE OF THE BEST bee plants known. Continuous nectar production. Bees work phacelia exclusively when available. Honey plant (produces excess nectar). - Cover crop: Fast-growing, suppresses weeds, prevents erosion, adds organic matter - Green manure: High biomass, decomposes quickly, releases nutrients - Nitrogen scavenger: Takes up excess nitrogen (prevent leaching), releases when incorporated - Beneficial insect habitat: Attracts predatory wasps, hoverflies, parasitoid wasps
Secondary Functions: - Companion planting: Attracts pollinators to nearby crops - Trap crop: Attracts pests away from main crops (some evidence) - Honey production: Beekeepers plant for honey crop (light, mild honey) - Ornamental: Beautiful lavender-blue flower clusters - Soil improvement: Deep roots break up compacted soil
What Pollinators It Attracts: - Bees: Honeybees, bumblebees, native solitary bees (MAGNET—bees go crazy) - Beneficial insects: Parasitic wasps, hoverflies, syrphid flies, predatory beetles - Butterflies: Some species visit - Bloom time: May-July (spring planting); September-October (fall planting)
🌱 Growing in WV Clay
Site Selection: FULL SUN to PART SHADE. Cool season annual—blooms best in spring, fall. Tolerates poor, clay, alkaline, droughty soils. Ideal for cover cropping, pollinator strips, between crop rows, fallow areas.
Soil Prep: Minimal required—grows in poor soil. - Loosen soil 4-6" deep - No amendment needed - No fertilizer needed
Planting: - Direct sow: March-April (spring) OR August-September (fall) - Depth: ¼-½" deep - Spacing: Broadcast or drill 8-12 lbs/acre; garden: sprinkle seeds, rake in - Germination: 7-14 days (cool soil OK) - Water well after planting
Care: - Water: Moderate; drought tolerant once established - Fertilizer: NOT NEEDED (scavenges nitrogen) - Weed suppression: Dense growth smothers weeds - Pest-free: Generally no pests, diseases
Propagation: - Seeds: No stratification needed. Direct sow spring or fall. - Self-sowing: Readily self-sows in favorable conditions - Seeds easy to collect: Shake dry seed capsules
✂️ Management
Green Manure: - When to incorporate: At flowering (before seed set) — peak biomass, nitrogen - How to incorporate: Mow, till under, or chop-and-drop - Decomposition: Fast (2-4 weeks) - Planting after: Wait 2-3 weeks before planting (allelopathic compounds break down)
Cover Crop: - Spring planting: March-April, blooms May-July, dies with summer heat - Fall planting: August-September, overwinters as rosette, blooms early spring, dies with heat - Biomass: Substantial (1-3 ft tall, dense growth) - Weed suppression: Excellent (dense canopy)
Containment: - Self-sowing: Readily self-sows if allowed to set seed - Management: Incorporate before seed set for green manure; let some seed for pollinator benefit - Not invasive: Annual (dies with frost in WV); well-behaved
Harvest: - Seeds: June-September, when capsules turn brown and dry - Cut flowers: Beautiful in bouquets
Chop-and-Drop: - Cut plants at flowering (peak nutrients) - Mulch around vegetables, fruit trees - Compost as green material - Decomposes quickly (soft tissue)
⚠️ Cautions
Invasive Potential: ✅ NONE - Annual (dies with frost in WV) - Self-sows but not aggressive - Well-behaved in garden settings
Other Cautions: - Allelopathy: Contains compounds that can inhibit germination of nearby seeds. Incorporate 2-3 weeks before planting main crop. Not a problem with established transplants. - Skin irritation: Hairy leaves can irritate sensitive skin (wear gloves when handling large quantities) - Allergies: Rare, but some people sensitive - Livestock: Generally safe; can be grazed but not highly palatable
🌳 Integration in Farm Design
Where to Plant: - Cover crop between vegetable rows - Pollinator strips, hedgerows - Fallow areas, bare soil - Orchards, vineyards (between rows) - Fall/winter cover crop (August-September planting) - Bee forage near apiaries - Companion planting near pollinator-dependent crops
Where NOT to Plant: - Where immediate planting is needed (wait 2-3 weeks after incorporation) - Formal gardens where self-sowing is unwanted - Deep shade (reduced bloom)
Guild Mates: - Other cover crops: Clover, vetch, winter rye - Pollinator plants: Black-eyed Susan, sunflower, borage - Vegetables: Plant nearby for pollination - Nitrogen fixers: Complementary cover crop
Design Applications: - Cover crop: Between crop rows, fallow areas - Pollinator strips: Along field edges, paths - Green manure: Incorporated before planting - Bee forage: Near apiaries, pollinator gardens - Fall cover: August-September planting (overwinters)
Economic Potential: - Cover crop seed: $3-5/lb - Honey production: Beekeepers value highly - Pollination services: Enhanced crop pollination
📖 Sources Consulted
- USDA PLANTS Database. Phacelia tanacetifolia profile. plants.usda.gov
- SARE (Sustainable Agriculture Research and Education). "Managing Cover Crops Profitably."
- Xerces Society. "Phacelia: A Beekeeper's Best Friend."
- California Crop Improvement Association. "Phacelia Seed Production."
- Johnny's Selected Seeds. "Phacelia Cultural Facts."
- Plants for a Future (PFAF). "Phacelia tanacetifolia." pfaf.org
- Toensmeier, Eric. (2013). Perennial Vegetables. Chelsea Green Publishing.
- Clark, Andy (ed.). (2007). Managing Cover Crops Profitably. SARE.
- Beekeeping associations, honey production resources
- Organic farming, permaculture resources
🔍 Quick Reference
| Attribute | Value |
|---|---|
| Native Status | ⚠️ Introduced (Western US) — Not invasive |
| Pollinators | ⭐⭐⭐⭐⭐ ONE OF BEST bee plants known |
| Bloom Time | May-July (spring); September-October (fall) |
| Cover Crop | ⭐⭐⭐⭐⭐ Excellent (weed suppression, erosion control) |
| Green Manure | ⭐⭐⭐⭐⭐ High biomass, fast decomposition |
| Drought Tolerance | ⭐⭐⭐⭐ Good once established |
| Self-Sowing | Readily self-sows (manageable) |
| Invasive Risk | ✅ NONE (annual, dies with frost) |
| Allelopathy | ⚠️ Mild (wait 2-3 weeks after incorporation) |
| Best Use | Cover crop, pollinator strips, green manure, bee forage |
Bottom Line: Phacelia is an outstanding annual cover crop and pollinator magnet for West Virginia. ONE OF THE BEST bee plants known—bees go crazy for it. Fast-growing, suppresses weeds, prevents erosion. Excellent green manure (high biomass, decomposes quickly). Cool season annual (plant spring or fall). Self-sows readily but not invasive. No serious pests or diseases. Essential plant for cover cropping, pollinator strips, bee forage, and any WV farm ecosystem focusing on soil health and pollinator support. 🐺💜🐝