North America Non-native Plant

Potamogeton ×cooperi

Botanical name: Potamogeton ×cooperi

USDA symbol: POCO42

Native status: Not native but doesn't reproduce and persist in the wild

Synonyms: Potamogeton ×cymatodes Asch. & Graebn. (POCY6)   

Potamogeton ×cooperi: The Mysterious Hybrid Pondweed for Water Gardens If you’re diving into the world of aquatic gardening, you might come across the intriguing Potamogeton ×cooperi, also known by its synonym Potamogeton ×cymatodes. This hybrid pondweed represents one of nature’s interesting botanical crossroads, though it remains somewhat of an enigma ...

Potamogeton ×cooperi: The Mysterious Hybrid Pondweed for Water Gardens

If you’re diving into the world of aquatic gardening, you might come across the intriguing Potamogeton ×cooperi, also known by its synonym Potamogeton ×cymatodes. This hybrid pondweed represents one of nature’s interesting botanical crossroads, though it remains somewhat of an enigma in the gardening world due to limited documentation about its specific characteristics.

What Makes This Plant Special?

Potamogeton ×cooperi is a hybrid pondweed, meaning it’s the result of natural cross-breeding between two parent Potamogeton species. Like other members of the pondweed family, this aquatic plant lives its entire life submerged or floating in freshwater environments, making it a specialized choice for water gardeners and pond enthusiasts.

While specific details about its native status and geographical distribution remain unclear in available documentation, hybrid pondweeds typically inherit characteristics from both parent species, potentially offering unique benefits for aquatic ecosystems.

Should You Plant It in Your Water Garden?

The decision to include Potamogeton ×cooperi in your aquatic landscape comes with some considerations:

  • Limited availability and documentation make it challenging to source and understand fully
  • As a hybrid, it may have unpredictable growth patterns
  • Aquatic plants can sometimes spread aggressively in ideal conditions
  • Best suited for experienced water gardeners who enjoy experimenting with unusual species

If you’re new to aquatic gardening or prefer well-documented plants, you might consider exploring other native pondweed species that are better understood and more readily available from reputable aquatic plant suppliers.

Growing Conditions and Care

Like other pondweeds, Potamogeton ×cooperi would typically require:

  • Permanent freshwater environment (ponds, water gardens, or large containers)
  • Submerged growing conditions
  • Full sun to partial shade
  • Stable water temperatures
  • Nutrient-rich pond substrate for root establishment

Wildlife and Ecological Benefits

Pondweeds generally provide valuable ecosystem services in aquatic environments, likely including:

  • Oxygen production for fish and other aquatic life
  • Habitat structure for small fish and invertebrates
  • Natural water filtration
  • Food source for waterfowl

The Bottom Line

Potamogeton ×cooperi represents an interesting but poorly documented option for aquatic gardens. While it may offer unique characteristics as a hybrid species, the lack of detailed growing information makes it a challenging choice for most gardeners. If you’re interested in supporting aquatic ecosystems, consider starting with well-established native pondweed species that are better understood and more readily available.

For the adventurous water gardener willing to experiment, this hybrid pondweed could be an intriguing addition—just be prepared for some uncertainty along the growing journey, and always source plants responsibly from reputable aquatic plant suppliers.

Potamogeton ×cooperi

Classification

Group

Monocot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Liliopsida - Monocotyledons

Subclass

Alismatidae

Order

Najadales

Family

Potamogetonaceae Bercht. & J. Presl - Pondweed family

Genus

Potamogeton L. - pondweed

Species

Potamogeton ×cooperi (Fryer) Fryer [excluded]

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA