Pursh's Phacelia (Phacelia purshii)

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Sunlight Full sun to partial shade; tolerates dry, rocky growing conditions and mild heat

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Watering Water deeply when the top 2 cm of soil is dry; drought-tolerant once established, avoid overwatering

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Temperature Hardy to light spring frosts; thrives in cool to temperate daytime temperatures

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Leaf: Alternate, lanceolate to ovate, coarsely serrated margins, covered in fine glandular hairs
Flower: Loose coiled cymes of pale blue to lavender bell-shaped blooms with five petals
Stem: Erect, branched, with soft, sticky glandular hairs

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Watering

Keep soil moderately moist during active growth and bloom period; reduce watering as foliage begins to senesce

Fertilization

No fertilization required; low-fertility soil supports healthy growth. Excess fertilizer may reduce bloom production and promote leggy growth

Crushed eggshell powder：Sprinkle a thin layer on soil surface at planting; no dilution needed, as low nutrient levels are preferred

Pruning

Deadhead spent blooms to encourage extended flowering and prevent self-seeding if desired
Remove yellowing or damaged foliage to improve airflow and reduce disease risk
Thin overcrowded seedlings shortly after germination to allow for proper root development

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Warning: this plant may be toxic.

Pets & Humans

Pets: No known toxicity to cats (ASPCA unlisted, no reported adverse effects)

Humans: No known toxicity to humans

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Culture: N/A

Usage: Pollinator habitat support, wildflower meadows, native plant gardens