Largeleaf pondweed
Potamogeton amplifolius
Last reviewed: October 2026
Largeleaf pondweed (Potamogeton amplifolius) is a perennial forb native to AL, AR, CA, CO and 33 more states. It blooms in June, July, and August.
Toxicity unknown
Largeleaf pondweed (Potamogeton amplifolius) is not listed by the ASPCA Animal Poison Control Center (opens in new tab) or the other sources we check, so we have no verdict for it either way. Absence from those lists is not a clearance. If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.
Light
full sun
Water
high
Size
12"–72" H × 24"–48" W
Bloom
Jun, Jul, Aug
Native to
AL, AR, CA, CO and 33 more states
Before you buy
Your city may pay you to plant this
Cities and water utilities offer rebates for replacing lawn with native and water-wise plants. We track 458 programs across 44 states, each with a link to the provider and the date we last checked it.
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Browse plants for this ecoregion
A submerged aquatic perennial with large, wavy, translucent underwater leaves and small floating leaves, sending up a short emergent spike of inconspicuous greenish flowers above the water surface. Grows rooted in the mud of lakes and slow-moving streams.
Growing Largeleaf pondweed
Grow Largeleaf pondweed in full sun and high water. Mature plants reach 12 to 72 inches tall and spread 24 to 48 inches wide.
Wildlife value
The dense underwater foliage provides critical habitat and food for waterfowl, fish, and aquatic invertebrates.
Common questions
- How much sun does Largeleaf pondweed need?
- Largeleaf pondweed grows best in full sun conditions.
- When does Largeleaf pondweed bloom?
- Largeleaf pondweed blooms in June, July, and August.
- Where is Largeleaf pondweed native?
- Largeleaf pondweed (Potamogeton amplifolius) is native to AL, AR, CA, CO and 33 more states, per the World Checklist of Vascular Plants (Kew).
Native range data from the World Checklist of Vascular Plants (Kew). Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
If something looks wrong
Common plant problems, and what to check first
These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.
- It is dying right after planting
- Leaves turning yellow
- Wilting even though I watered it
- Brown crispy leaf tips
- Bugs on the plant
Ready to grow Largeleaf pondweed? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.