North America Non-native Plant

Calamagrostis ×kolymensis

Botanical name: Calamagrostis ×kolymensis

USDA symbol: CAKO7

Habit: grass

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

Calamagrostis ×kolymensis: The Mystery Reed Grass Hybrid If you’ve stumbled upon the name Calamagrostis ×kolymensis in your plant research, you’re not alone in finding limited information about this particular grass. This intriguing species represents one of nature’s more elusive botanical puzzles – a hybrid reed grass that seems to keep ...

Calamagrostis ×kolymensis: The Mystery Reed Grass Hybrid

If you’ve stumbled upon the name Calamagrostis ×kolymensis in your plant research, you’re not alone in finding limited information about this particular grass. This intriguing species represents one of nature’s more elusive botanical puzzles – a hybrid reed grass that seems to keep its secrets well hidden from most gardening resources.

What is Calamagrostis ×kolymensis?

Calamagrostis ×kolymensis belongs to the reed grass genus, part of the vast grass family. The × symbol in its name tells us this is a hybrid – meaning it’s the offspring of two different Calamagrostis species that crossed naturally in the wild. Like other members of its genus, this would be a graminoid plant, which simply means it’s grass-like in appearance and growth habit.

Reed grasses are typically perennial plants that form clumps or tufts, with narrow leaves and feathery flower heads that dance gracefully in the breeze. However, the specific characteristics of this particular hybrid remain largely undocumented in readily available horticultural literature.

The Information Gap

Here’s where things get interesting – and a bit frustrating for curious gardeners. Despite our best research efforts, detailed information about Calamagrostis ×kolymensis is remarkably scarce. We don’t have clear data on:

  • Its common name or regional nicknames
  • Specific native range or geographical distribution
  • Exact growing conditions and care requirements
  • USDA hardiness zones
  • Wildlife and pollinator benefits
  • Garden suitability and landscape applications

Should You Try to Grow It?

Without clear information about this plant’s characteristics, growing requirements, or even availability in the nursery trade, it’s difficult to recommend seeking out Calamagrostis ×kolymensis for your garden. The lack of documentation might indicate that it’s either extremely rare, not commonly cultivated, or perhaps exists primarily in scientific collections rather than commercial horticulture.

Better-Known Alternatives

If you’re drawn to the reed grass family, consider these well-documented alternatives that offer proven garden performance:

  • Calamagrostis × acutiflora ‘Karl Foerster’ – A popular ornamental grass with excellent structure
  • Calamagrostis brachytricha – Korean feather reed grass with beautiful fall color
  • Native grass species appropriate to your specific region

These alternatives come with the advantage of established growing guides, known characteristics, and availability through reputable nurseries.

The Takeaway

Calamagrostis ×kolymensis remains something of a botanical mystery in the gardening world. While it may exist in scientific collections or specialized botanical gardens, the lack of available information makes it impractical for most home gardeners to pursue. Sometimes the most honest gardening advice is admitting when we simply don’t know enough about a plant to recommend it confidently.

If you’re specifically interested in this hybrid for research purposes, consider reaching out to botanical institutions, university herbaria, or grass specialists who might have more detailed information about this elusive reed grass.

Calamagrostis ×kolymensis

Classification

Group

Monocot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Liliopsida - Monocotyledons

Subclass

Commelinidae

Order

Cyperales

Family

Poaceae Barnhart - Grass family

Genus

Calamagrostis Adans. - reedgrass

Species

Calamagrostis ×kolymensis Kom. (pro sp.) [excluded] (pro sp.)

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