Phacelia campanularia

Intensely blue bell-shaped flowers make this desert annual one of the most striking wildflowers you can grow from seed.
A cool-season annual in USDA zones 9-11; fall-sown for spring bloom in the low desert, it finishes before summer heat and reseeds where drainage is sharp.
AMWUA Notes
Skin irritant β wear gloves when handling.
Winter rains often suffice; supplement every 2-3 weeks during dry cool-season spells, ensuring sharp drainage since it rots in wet soil.
None; the plants flower and set seed, then dry β leave them to reseed before cleanup, and wear gloves, as the foliage can irritate skin.
None needed; it thrives in lean, sandy desert soil.
Trouble-free.
A cool-season desert annual; sow seed in fall for brilliant blue spring bells, then let it dry and reseed as heat arrives.
Lean, sandy or gravelly, sharply drained desert soils; rots in wet soil; thrives in poor, gritty ground.
Needs sharp, fast-draining soil.
None β thrives in lean desert soil without fertilizer.
Seed; sow in fall (cool-season) in gravelly ground and let it dry and reseed.
1 ft
Minimal; a shallow-rooted annual that reseeds where drainage is sharp. Wear gloves, as foliage can irritate skin.
Attracts
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Data from 2024 AMWUA βLandscape Plants for the Arizona Desertβ guide.