trefle.io · Taken May 14, 2014 by Dieter Albrecht (cc-by-sa)
Fabaceae
Washington lupin
Lupinus polyphyllus
Also known as Washington lupine, Bigleaf lupine, Large-leaved lupine
Native Plants · Lupin · Lupine · Pollinator · Cottage Garden · Perennial · Tall Flowers · Nitrogen Fixer · Colorful · Border Plant · Wildlife Garden
Washington lupin is a striking perennial that produces tall spires of colorful flowers from late spring into summer, thriving in full sun to partial shade with well-drained, slightly acidic soil. It is a nitrogen-fixing plant, naturally improving soil fertility, and requires little fertilizing as a result. Cut back flower spikes after blooming to encourage a second flush and divide clumps every few years to maintain vigor.
Growing conditions
The details behind the basics
- Daily light
- 5 hours
- Watering
- Water moderately; allow the top inch of soil to dry between waterings once established · Every 7-14 days
- Maintenance
- Low
- Soil
- loam
- Soil pH
- 5–5.5
- Temperature
- -20°F to 85°F
- Cycle
- Perennial
- Propagation
- Seed
Hardiness
USDA 5a-9b
Form & growth
Mature size and habit
- Mature height
- 12 in – 3 ft
- Spread
- 2 ft
- Spacing
- 24 in apart
- Growth rate
- Moderate
- Root depth
- Medium
- Flowers
- No
- Foliage
- Medium
Ecology & origin
Where it belongs and what it brings
- Native to
- Alberta, Altay, Argentina South, Austria, Baltic States, Bangladesh, Belarus, Belgium, British Columbia, Bulgaria, California, Central European Rus, Chile South, Connecticut, Czechoslovakia, Denmark, East European Russia, Finland, France, Germany
- Attracts
- Bees, Butterflies, Hummingbirds, Moths
Sources: trefle, usda
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