North America Non-native Plant

Comet Grass

Botanical name: Perotis rara

USDA symbol: PERA10

Habit: grass

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

Comet Grass: The Mysterious Beauty You’ve Probably Never Heard Of If you’re the type of gardener who loves discovering hidden gems in the plant world, let me introduce you to comet grass (Perotis rara). This intriguing grass species might not be on everyone’s radar, but it certainly deserves a closer ...

Comet Grass: The Mysterious Beauty You’ve Probably Never Heard Of

If you’re the type of gardener who loves discovering hidden gems in the plant world, let me introduce you to comet grass (Perotis rara). This intriguing grass species might not be on everyone’s radar, but it certainly deserves a closer look – even if that look comes with more questions than answers!

What Exactly Is Comet Grass?

Comet grass belongs to the Poaceae family, which means it’s a true grass rather than just a grass-like impostor. The botanical name Perotis rara hints at its elusive nature – rara literally means rare, which might explain why you won’t find this species at your local garden center.

As a member of the grass family, comet grass shares characteristics with other grasses: narrow leaves, jointed stems, and that unmistakable grass-like growth pattern that makes it blend seamlessly into natural landscapes.

The Challenge of Growing the Unknown

Here’s where things get interesting (and a bit frustrating): comet grass is something of a botanical mystery. While we know it exists and has earned its common name for presumably good reasons, detailed growing information is surprisingly scarce. This presents both an opportunity and a challenge for adventurous gardeners.

Geographic Distribution and Native Range

Unfortunately, specific information about where comet grass naturally occurs is not readily available in standard gardening resources. This lack of clear geographic data makes it difficult to determine its native status or ideal growing regions.

Garden Potential and Considerations

Without clear cultivation guidelines, growing comet grass becomes an exercise in educated guessing and careful observation. Here’s what we can reasonably assume:

  • As a grass species, it likely prefers well-draining soil
  • Most grasses are relatively hardy once established
  • It may provide texture and movement in landscape designs
  • Could potentially offer habitat value for small wildlife

The Responsible Gardener’s Approach

Given the limited information available about comet grass, here are some thoughtful considerations:

  • Research thoroughly before attempting to acquire or grow this species
  • If you do encounter it, document your observations to contribute to botanical knowledge
  • Consider well-documented native grass alternatives for your region
  • Consult with local native plant societies or botanical experts

Alternative Native Grasses to Consider

While the mystery of comet grass remains unsolved, there are plenty of well-documented native grasses that can provide beauty and ecological benefits in your garden. Consider researching native grass species specific to your region that offer:

  • Proven adaptability to local conditions
  • Clear growing guidelines
  • Known wildlife benefits
  • Readily available plant material

The Bottom Line

Comet grass represents one of those fascinating botanical puzzles that remind us how much we still don’t know about the plant kingdom. While its rarity and mysterious nature might appeal to collectors and botanical enthusiasts, practical gardeners might be better served by choosing native grasses with proven track records and available growing information.

If you do happen to encounter Perotis rara in your gardening adventures, consider yourself lucky – you’ve stumbled upon one of nature’s more elusive characters. Just remember to approach it with respect, responsibility, and a healthy dose of scientific curiosity.

Comet Grass

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

Perotis Aiton

Species

Perotis rara R. Br. - comet grass

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