North America Native Plant

Peculiar Moonwort

Botanical name: Botrychium paradoxum

USDA symbol: BOPA9

Life cycle: perennial

Habit: forb

Native status: Native to Canada âš˜ Native to the lower 48 states  

Peculiar Moonwort: A Mysterious Native Fern Worth Knowing If you’ve ever wondered about the more elusive members of our native plant communities, meet the peculiar moonwort (Botrychium paradoxum). This small, unassuming fern lives up to its name in more ways than one – it’s both peculiar in appearance and paradoxically ...

Rare plant alert!

Region: Conservation status by state

Status: S3S4: Status is uncertain but is somewhere between the following rankings: Vulnerable: Either very rare and local throughout its range, found only in a restricted range (even if abundant at some locations), or factors are making it vulnerable to extinction. Typically 21 to 100 occurrences or between 3,000 and 10,000 individuals ⚘ Apparently Secure: Uncommon but not rare, and usually widespread. Possibly cause for longterm concern. Typically more than 100 occurrences in the state or more than 10,000 individuals ⚘

Peculiar Moonwort: A Mysterious Native Fern Worth Knowing

If you’ve ever wondered about the more elusive members of our native plant communities, meet the peculiar moonwort (Botrychium paradoxum). This small, unassuming fern lives up to its name in more ways than one – it’s both peculiar in appearance and paradoxically challenging to find and grow.

What Makes This Moonwort So Special?

The peculiar moonwort is a perennial fern that belongs to the fascinating world of Botrychium species, commonly known as moonworts or grape ferns. These aren’t your typical garden ferns with lacy, cascading fronds. Instead, they’re compact, almost secretive plants that emerge from the ground with a distinctive two-part structure: a sterile leaf blade and a separate fertile spike that bears the spores.

What sets Botrychium paradoxum apart from its moonwort relatives is its unique frond shape and growing patterns. The plant typically reaches just a few inches tall, making it easy to overlook among other forest floor vegetation.

Where You’ll Find Peculiar Moonwort

This native North American species calls both Canada and the United States home. You can find it growing naturally in Alberta, British Columbia, Saskatchewan, Idaho, Montana, Oregon, Utah, and Washington. It favors the cooler, mountainous regions of the western continent, often appearing in montane and subalpine environments.

A Word About Rarity

Here’s something important to know: the peculiar moonwort has a conservation status of S3S4, which means it ranges from vulnerable to apparently secure depending on the location. This isn’t a plant you’ll find at your local nursery, nor should you attempt to dig it up from the wild. If you’re fortunate enough to spot one in nature, consider yourself lucky and leave it undisturbed.

Should You Try Growing Peculiar Moonwort?

Here’s where things get interesting – and challenging. Unlike many native plants that adapt well to garden settings, moonworts are notoriously difficult to cultivate. They have very specific requirements that are tough to replicate:

  • They need particular mycorrhizal fungi partnerships to survive
  • Their growing conditions are quite specialized
  • They often have unpredictable emergence patterns
  • Seeds require very specific conditions to germinate

For most gardeners, the peculiar moonwort isn’t a practical choice for home landscapes. Even experienced native plant enthusiasts often struggle with moonwort cultivation.

Better Alternatives for Your Native Garden

If you’re drawn to the idea of growing native ferns in your western garden, consider these more garden-friendly alternatives that share the same geographic range:

  • Lady fern (Athyrium filix-femina)
  • Bracken fern (Pteridium aquilinum)
  • Western sword fern (Polystichum munitum)
  • Fragile fern (Cystopteris fragilis)

The Ecological Value

While peculiar moonwort might not be the showstopper in your garden, it plays an important role in its native ecosystems. These small ferns are indicators of healthy, undisturbed habitats. They contribute to biodiversity and provide habitat complexity in their native forest and meadow communities.

How to Identify Peculiar Moonwort

If you’re hiking in moonwort territory and want to try spotting one, here’s what to look for:

  • Small size – usually just a few inches tall
  • Two distinct parts: a vegetative leaf and a separate spore-bearing stalk
  • Appears in spring to early summer, often disappearing by midsummer
  • Grows in small populations or as solitary plants
  • Prefers moist, well-drained soils in partial shade

The Bottom Line

The peculiar moonwort is one of those special native plants that’s better appreciated in the wild than attempted in cultivation. Its rarity and specific growing requirements make it unsuitable for most home gardens. Instead, enjoy learning about this fascinating fern and perhaps keep an eye out for it during your outdoor adventures in the western mountains.

If you’re passionate about supporting native biodiversity, focus on growing the more adaptable native ferns and plants in your region. You’ll have much better success, and you’ll still be creating valuable habitat for local wildlife. Sometimes the best way to appreciate a plant is simply knowing it exists and thrives somewhere out there in the wild.

Peculiar Moonwort

Classification

Group

Fern

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision
Division

Pteridophyta - Ferns

Subdivision
Class

Filicopsida

Subclass
Order

Ophioglossales

Family

Ophioglossaceae Martinov - Adder's-tongue family

Genus

Botrychium Sw. - grapefern

Species

Botrychium paradoxum W.H. Wagner - peculiar moonwort

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