How to Grow Arrowleaf
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Arrowleaf
Sagittaria latifolia
vegetableArrowleaf, also known as duck potato or wapato, is an aquatic or semi-aquatic perennial plant native to North America that produces starchy tubers edible to humans and wildlife. The plant is characterized by distinctive arrow-shaped leaves that emerge above the water surface and delicate white flowers with purple centers. It has been used as a food source by Indigenous peoples for centuries and is still cultivated in wetland gardens and native plant landscapes.
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Example Arrowleaf timeline · Pittsburgh, PA (Zone 6b)
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Plant Arrowleaf
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Arrowleaf
Around Jul 16≈ 90 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Arrowleaf dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-9, prefers cooler northern regions
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Tuber Sprouting
2-4 weeksTubers begin to sprout roots and shoots as water warms in spring. Small white shoots emerge from the tuber.
Plant tubers in muddy substrate in spring after last frost. Ensure consistent water depth and temperature of at least 50°F. Keep tubers submerged.
Leaf Development
4-6 weeksJuvenile heart-shaped leaves appear at the water surface, followed by the characteristic arrow-shaped leaves. Plant grows 1-3 feet tall above water.
Maintain water depth at 6-12 inches. Remove algae that may compete for nutrients. Ensure adequate sunlight reaches developing foliage.
Flowering
3-4 weeks (June-August)Delicate white flowers with purple-tipped centers appear on emergent stalks above the water surface. Flowers are typically whorled in groups of three.
Flowering indicates tuber development is progressing. Maintain consistent water levels and fertilize lightly with aquatic plant fertilizer if needed.
Tuber Development
6-8 weeksAs flowers fade, underground tubers grow and enlarge beneath the plant. Foliage may gradually decline as energy is directed to tuber production.
Reduce water level slightly to allow soil consolidation around developing tubers. Avoid disturbing the planting area.
Dormancy & Harvest
Throughout fall and winterFoliage dies back and tubers enter dormancy in fall and winter. Tubers are firm and starch-rich at this stage.
Harvest after foliage dies back in fall (October-November). Tubers can overwinter in place if water is maintained or can be dug and stored.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Manual removal; maintain water quality to reduce stress; introduce native predators like dragonflies
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and
Protective fencing in vulnerable areas; plant in densely vegetated regions; accept some grazing as natural wildlife use
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Hand-pick if excessive; introduce predatory fish; maintain balanced ecosystem
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Ensure water circulation; prevent water stagnation; use well-draining substrate
Uses
Starchy Tuber Vegetable
CulinaryArrowleaf tubers are edible starchy vegetables with a nutty flavor, similar to chestnuts or potatoes. They can be boiled, roasted, fried, or dried and ground into flour for traditional Indigenous cuisine. [source]
Waterfowl and Wildlife Food
WildlifeArrowleaf is a keystone native plant that provides tubers, seeds, and shelter for ducks, geese, muskrats, and other wetland wildlife. It was traditionally harvested by Indigenous peoples and waterfowl simultaneously. [source]
Wetland Restoration
HouseholdArrowleaf is used to restore degraded wetlands and shallow pond ecosystems, helping to filter water, prevent erosion, and restore native plant communities. [source]
Traditional Medicine
MedicinalSagittaria has been used in Traditional Chinese Medicine to treat digestive issues and inflammation. The plant contains compounds with potential anti-inflammatory properties. [source]
Ornamental Aquatic Planting
CraftThe distinctive arrow-shaped leaves and delicate white flowers make arrowleaf an attractive addition to water gardens, artificial ponds, and rain gardens for ornamental purposes. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Harvest tubers in fall after foliage dies back (October-November), when tubers are mature and starch content is highest. Carefully dig or wade into the muddy substrate to locate and extract tubers without damaging them. Tubers range from 1-2 inches long and are usually clustered around the mother plant. Can be harvested fresh or stored in cool, moist conditions for several months. Leave some tubers unharvested to ensure population return next season.
Fun Facts
- 🌱 Arrowleaf tubers were a staple food of Pacific Northwest Indigenous peoples, especially the Chinook and Cowlitz nations, who harvested them using specialized digging sticks.
- 🌱 The plant gets its common name 'duck potato' because waterfowl eagerly consume the tubers, and the plant naturally spreads through wildlife dispersal of vegetative propagules.
- 🌱 A single arrowleaf plant can produce 15-50 tubers in a season, making it a highly productive aquatic crop with minimal maintenance.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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