Amaryllidaceae
Allium validum
Allium validum
Flowering Plants · Native Plants · Native · Allium · Wetland · Perennial · Wildflower · Shade Tolerant · Western Native · Bulb · Pollinator
Swamp onion thrives in moist to wet soils and is well suited to rain gardens, streambanks, or bog-like conditions in partial shade. Water regularly to maintain consistent soil moisture, especially during dry spells. This hardy native perennial requires little fertilization but benefits from being planted in organically rich, well-draining yet reliably moist ground.
Growing conditions
The details behind the basics
- Daily light
- 4 hours
- Watering
- Water thoroughly until moist; keep soil consistently damp but not waterlogged · Every 7-10 days
- Maintenance
- Moderate
- Soil
- loam
- Soil pH
- 6.2–8
- Temperature
- -25°F to 95°F
- Cycle
- Perennial
- Propagation
- Seed, Division, Cutting
Hardiness
USDA 4b-9b
Form & growth
Mature size and habit
- Mature height
- 12 in – 4 ft
- Spread
- 4 ft
- Spacing
- 6 in apart
- Growth rate
- Moderate
- Root depth
- Medium
- Flowers
- Purple
- Foliage
- Green · Medium
Ecology & origin
Where it belongs and what it brings
- Native to
- British Columbia, California, Idaho, Nevada, Oregon, Washington
- Attracts
- Bees, Butterflies, Birds
Sources: trefle, usda
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