Great Yellow Pond-lily

The Great Yellow Pond-lily (Nuphar polysepala) — wokas — is a magnificent native water lily whose big leathery leaves and golden, brandy-scented globe-flowers float on still water, and whose seeds are one of the great First Foods of the Klamath Basin.^1, 3

NOTE: Be prepared to submerge potted plant upon arrival.

NOTE: Be ready to submerge plant upon arrival.

Edible & Medicinal Uses

The prize is the seed — wokas — a celebrated, carbohydrate-rich wild food. Ripe pods are gathered, sun-dried, and pounded to free the seeds, which are then parched until they pop like tiny popcorn, or ground into meal for mush, gruel, soup, and bread.³ The seeds were once gathered by canoe from thousands of acres of marsh. Young leaves can be added to soups, and the flowers steeped as a tea.¹

A note on the rhizome: unlike the seeds, the thick rhizome is astringent and has been used more as medicine than food — some ate it cooked, while others found it unpalatable or avoided it entirely. Traditionally the rootstock is steeped as a gargle for sore throats and made into poultices for boils and swelling.⁴ Approach the rhizome with caution and enjoy the seeds for eating — traditional use, not medical advice.

Ornamental Qualities

Bold and beautiful on the water, Great Yellow Pond-lily lifts glossy, leathery, heart-shaped leaves — six to eighteen inches across — that float and stand just above the surface, with waxy, cup-shaped, deep-yellow flowers (faintly scented of brandy) rising on stout stalks all summer, followed by flask-shaped green pods.¹ It's a dramatic centerpiece for a pond or a large water container.²

Environment & Culture

Ecology: Native across western North America, from Alaska and the Yukon south to California and the Rockies, it grows in ponds, shallow lakes, oxbows, and slow streams with mucky bottoms.¹ Pollinated by flies and beetles, it's a keystone of pond life — its leaves shade and shelter fish, its rhizomes feed beavers and muskrats, and the whole stand hosts aquatic insects and waterfowl.²

Culture: Wokas remains central to Klamath and Modoc foodways, and the Klamath Tribes actively steward and restore their wocus beds, including with traditional burning.³ We offer this plant with respect for that living knowledge and invite support for Indigenous-led restoration through our Charitable Giving page.

In the Kitchen

The classic treat: parch the dried seeds in a hot, dry pan until they pop like miniature popcorn, or grind them into a nutty meal for porridge and flatbread. Add the young leaves to soups. (Stick to the seeds — leave the astringent rhizome to the herbalists.) Growing details are on the Planting Guide tab.

Attributes

• Native Range: Alaska/Yukon to California & the Rockies; ponds, lakes, slow streams¹
• USDA Zones: ~4–9²
• Light: Full sun (tolerates part shade)²
• Water: Aquatic — still or slow water, ~1–3 ft deep¹
• Soil: Mucky pond bottom; heavy loam or clay²
• Habit: Aquatic perennial; big floating leaves, yellow globe flowers¹
• Edible: Seeds ("wokas") — popped or ground³

References

1. Wikipedia & Flora of North America, Nuphar polysepala; Calscape.
2. Pojar, J. & MacKinnon, A., Plants of the Pacific Northwest Coast, 2014; Washington Native Plant Society.
3. Turner & Szczawinski; The Klamath Tribes, Restoration Plan for Wocus; Moerman, D., Native American Ethnobotany, 1998.
4. E-Flora BC; Schofield, Discovering Wild Plants (rhizome medicine & cautions).