How far apart should I plant Phacelia?

Plant Phacelia 20cm apart with 30cm between rows.

When does Phacelia flower?

Phacelia typically flowers approximately 55 days after transplanting.

Phacelia is classified as Hardy.

Phacelia tanacetifolia

Hardy Cool Season Continuous Harvest

Direct sow outdoors as soon as soil reaches 8°C — typically early to mid spring. Hardy enough to tolerate light frosts.

Sow seeds

Germination ~10d

Flowering ~55d

Sow seeds

Germination ~10d

Flowering ~55d

Approximate days from start

Care Essentials

No feeding needed. Phacelia thrives in poor to average soil and actually performs its green manure function best without added fertility.
Phacelia is a fast-growing hardy annual with dual purpose — a stunning bee-magnet flower and an excellent green manure. It germinates quickly, grows fast, and flowers within 6-8 weeks of sowing. As green manure, it builds organic matter, suppresses weeds, and its fine roots improve soil structure. Bees are intensely attracted to the lavender-blue flowers. Can be sown spring through early autumn.

Companion Planting

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Growing Conditions

Min. soil temperature: 8°C+

Germination temperature: 10–25°C

Get a personalized schedule for Phacelia based on your exact frost dates

Space 20 cm apart or broadcast seed thinly for green manure use. For ornamental borders, thin to 20 cm for best display.

Feeding: No feeding needed. Phacelia thrives in poor to average soil and actually performs its green manure function best without added fertility.
Watch for: Slugs on young seedlings
Aphids (rarely serious)
Self-seeding if allowed to set seed

How far apart should I plant Phacelia?: Plant Phacelia 20cm apart with 30cm between rows.
When does Phacelia flower?: Phacelia typically flowers approximately 55 days after transplanting.
Is Phacelia frost hardy?: Phacelia is classified as Hardy.

Plan Phacelia in your garden — get personalized frost-date scheduling