Native Plants

Ruffled Spleenwort

Asplenium plenum

USDA symbol: ASPL10

perennial forb

Lower 48 states: native

Meet the ruffled spleenwort (Asplenium plenum), one of Florida’s most elusive native ferns. This little-known perennial species is a true botanical gem that most gardeners will never encounter in the wild – and for good reason. It’s incredibly rare. The ruffled spleenwort is native to the lower 48 states, but ...

Ruffled Spleenwort may be listed as rare in your area.
Global Conservation Status

Status: S1Q | Critically imperiled: Typically 5 or fewer occurrences or under 1,000 remaining individuals.

Ruffled Spleenwort: Florida’s Rare Native Fern Treasure

Meet the ruffled spleenwort (Asplenium plenum), one of Florida’s most elusive native ferns. This little-known perennial species is a true botanical gem that most gardeners will never encounter in the wild – and for good reason. It’s incredibly rare.

A Florida Native with a Very Small Footprint

The ruffled spleenwort is native to the lower 48 states, but you’ll only find it naturally growing in Florida. This fern has an extremely limited geographic distribution, making it one of the state’s most precious native plant species. Its rarity cannot be overstated – this is not your typical backyard fern.

  • Species observed
  • No observations

What Makes It Special?

True to its common name, the ruffled spleenwort displays distinctive fronds with ruffled or pleated margins that set it apart from other Asplenium species. This small, delicate fern brings a unique texture to shaded spaces with its characteristic frond structure that looks almost crimped along the edges.

Conservation Status: Handle with Care

Here’s where things get serious: the ruffled spleenwort has a Global Conservation Status of S1Q, indicating it’s critically imperiled. This means the species faces a very high risk of extinction due to extreme rarity. If you’re considering adding this fern to your collection, you must ensure any plant material comes from responsible, ethical sources – never wild-collected specimens.

Growing Conditions and Care

Should you be fortunate enough to acquire responsibly sourced ruffled spleenwort, here’s what this Florida native needs to thrive:

  • Light: Shade to deep shade – this fern naturally grows in protected, low-light environments
  • Soil: Well-draining but consistently moist soil with good organic content
  • Climate: USDA Hardiness Zones 9-11, matching its native Florida range
  • Humidity: High humidity levels, which can be challenging to maintain outside its native habitat
  • Protection: Shelter from wind and temperature extremes

Is This Fern Right for Your Garden?

Let’s be honest – the ruffled spleenwort isn’t for every gardener. Its extreme rarity means it’s primarily suited for:

  • Specialized native plant collections
  • Conservation-minded gardeners with experience growing rare species
  • Botanical gardens and educational institutions
  • Advanced fern enthusiasts in appropriate climate zones

Wildlife and Ecological Benefits

As a fern, the ruffled spleenwort doesn’t produce flowers or nectar for pollinators. However, like other native ferns, it likely plays a role in its ecosystem by providing habitat structure and contributing to the complex web of native plant communities in its limited Florida habitat.

The Bottom Line

The ruffled spleenwort represents something special in the world of native plants – a reminder that some species exist on the very edge of survival. While most gardeners should focus on more readily available native ferns, those with the knowledge, resources, and commitment to conservation might consider this species as part of a specialized collection. Just remember: with great rarity comes great responsibility. Only source from reputable suppliers who can guarantee ethical propagation, and consider your role as a steward of this remarkable Florida native.

If you’re drawn to native ferns but want more accessible options, consider other Florida natives like cinnamon fern or royal fern – species that offer similar aesthetic appeal without the conservation concerns.

Classification

Group: Fern
Kingdom: Plantae - Plants
Subkingdom: Tracheobionta - Vascular plants
Division: Pteridophyta - Ferns
Class: Filicopsida
Order: Polypodiales
Family: Aspleniaceae Newman - Spleenwort family
Genus: Asplenium L. - spleenwort

Species: Asplenium plenum E.P. St. John ex Small - ruffled spleenwort

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