Nymphaeaceae
Rocky mountain cowlily
Nuphar polysepala
Also known as Yellow pond lily, Rocky Mountain pond lily, Castalia polysepala, Nymphaea polysepala
Flowering Plants · Native Plants · Aquatic · Pond Plant · Water Lily · Native · Yellow Flower · Wetland · Rhizome · Pacific Northwest · Water Garden · Perennial
Rocky Mountain cowlily is an aquatic perennial that requires permanent submersion in a pond or water garden with at least 1–3 feet of still or slow-moving water. Plant rhizomes in heavy clay soil at the bottom of a pond and ensure at least 4 hours of dappled sunlight daily. This plant is best suited to outdoor water features in cooler climates and is not appropriate for indoor or container growing without a dedicated aquatic setup.
Growing conditions
The details behind the basics
- Daily light
- 4 hours
- Watering
- Keep roots permanently submerged in still or slow-moving water at all times · Continuously submerged; maintain 1-3 feet of standing water
- Maintenance
- High
- Soil
- loam
- Soil pH
- 5–8
- Temperature
- -25°F to 95°F
- Cycle
- Perennial
- Propagation
- Seed
Hardiness
USDA 4b-9b
Form & growth
Mature size and habit
- Mature height
- 20 ft – 40 ft
- Spread
- 20 ft
- Spacing
- 36 in apart
- Growth rate
- Fast
- Root depth
- Medium
- Flowers
- Yellow
- Foliage
- Green · Coarse
Ecology & origin
Where it belongs and what it brings
- Native to
- Alaska, Aleutian Is., Arizona, British Columbia, California, Colorado, Idaho, Montana, Nevada, New Mexico, Northwest Territorie, Oregon, Utah, Washington, Wyoming, Yukon
- Attracts
- Bees, Butterflies, Birds
Sources: trefle, usda
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