Twin Oaks Valley Greenhouses
$7.50–$18.00Distance unavailable · 2245 North Twin Oaks Valley Road, San Marcos, CA 92069
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trefle.io · Taken Jun 2, 2021 by Jon Jensen (cc-by-sa)
Amaryllidaceae
Hooker's onion
Allium acuminatum
Also known as Allium murrayanum, Allium cuspidatum, Wild onion, Allium elwesii
Zones 4–9Sun Full SunWater ModerateCare Low
Flowering Plants · Native Plants · Native Bulb · Drought Tolerant · Rock Garden · Wildflower · Western Native · Spring Blooming · Onion · Allium · Low Water
Pet-safeBeginner-friendlyAttracts pollinators
In stock at 1 nurseryStock updated 9/6/2026
Hooker's onion is a small, drought-adapted bulb native to western North America that thrives in well-drained to dry soils in full sun to part shade. Plant bulbs in fall and allow them to go dormant in summer — avoid supplemental watering once foliage begins to die back. Its cheerful rose-pink flower clusters in spring make it a lovely addition to rock gardens or native meadow plantings.
Growing conditions
The details behind the basics
- Daily light
- 6 hours
- Watering
- Water moderately during spring growth; allow soil to dry completely between waterings · Every 10-14 days during active growth; minimal in summer dormancy
- Maintenance
- Low
- Soil
- loam
- Soil pH
- 6–8
- Temperature
- -25°F to 95°F
- Cycle
- Perennial
- Propagation
- Seed
Hardiness
USDA 4b-9b
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Form & growth
Mature size and habit
- Mature height
- 20 ft – 40 ft
- Spread
- 20 ft
- Spacing
- 6 in apart
- Growth rate
- Fast
- Root depth
- Medium
- Flowers
- Purple
- Foliage
- Green · Fine
Ecology & origin
Where it belongs and what it brings
- Native to
- Arizona, British Columbia, California, Colorado, Idaho, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming
- Attracts
- Bees, Butterflies
Sources: trefle, usda
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