North America Non-native Plant

Speenwort

Botanical name: Asplenium caudatum

USDA symbol: ASCA41

Life cycle: perennial

Habit: forb

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

The Mysterious Speenwort: Getting to Know Asplenium caudatum If you’ve stumbled upon the name Asplenium caudatum while researching ferns for your garden, you’ve discovered one of the more elusive members of the spleenwort family. This perennial fern has managed to keep a relatively low profile in the gardening world, which ...

The Mysterious Speenwort: Getting to Know Asplenium caudatum

If you’ve stumbled upon the name Asplenium caudatum while researching ferns for your garden, you’ve discovered one of the more elusive members of the spleenwort family. This perennial fern has managed to keep a relatively low profile in the gardening world, which makes it all the more intriguing for plant enthusiasts who love a good botanical mystery.

What Exactly Is Asplenium caudatum?

Asplenium caudatum belongs to the large and diverse genus Asplenium, commonly known as spleenworts. These are evergreen or semi-evergreen ferns that have been quietly beautifying landscapes for millions of years. The name spleenwort comes from an old belief that these ferns could cure ailments of the spleen – though we now know they’re much better at curing boring garden corners than medical conditions!

As a perennial fern, Asplenium caudatum returns year after year, developing its characteristic fronds that unfurl in the classic fiddlehead fashion that makes fern enthusiasts swoon every spring.

The Geographic Mystery

Here’s where things get interesting – or frustrating, depending on your perspective. The specific geographic distribution of Asplenium caudatum isn’t well-documented in readily available sources. This could mean it’s either quite rare, has limited distribution, or possibly that it’s known by different names in different regions.

Is This Fern Right for Your Garden?

Since specific growing information for Asplenium caudatum is limited, any gardener considering this fern should approach it with the general knowledge that most Asplenium species prefer:

  • Partial to full shade conditions
  • Well-draining but consistently moist soil
  • Protection from harsh winds
  • Organic-rich growing medium

Benefits to Your Garden Ecosystem

While ferns don’t produce the showy flowers that attract pollinators like bees and butterflies, they offer other valuable ecosystem services:

  • Provide habitat and shelter for small creatures like salamanders and insects
  • Help prevent soil erosion with their root systems
  • Add year-round structure and texture to shaded garden areas
  • Create a naturalistic woodland atmosphere

How to Identify Asplenium Species

If you’re trying to identify whether you have Asplenium caudatum or another spleenwort species, look for these general characteristics:

  • Fronds that emerge from a central crown
  • Linear sori (spore-bearing structures) on the undersides of fronds
  • Generally evergreen or semi-evergreen nature
  • Preference for growing in rock crevices or on walls in many species

A Word of Caution and Advice

Given the limited specific information available about Asplenium caudatum, we’d recommend proceeding with caution if you’re considering adding this particular species to your garden. It’s possible that what’s being sold or discussed as A. caudatum might actually be a different, better-known species in the genus.

If you’re drawn to spleenworts for your garden, consider starting with well-documented native species like Asplenium platyneuron (Ebony Spleenwort) or Asplenium trichomanes (Maidenhair Spleenwort), which have clear growing requirements and known benefits to local ecosystems.

The Bottom Line

Asplenium caudatum remains something of an enigma in the fern world. While the mystery surrounding this species might appeal to adventurous gardeners, those seeking reliable garden performers might want to stick with better-documented fern species until more information becomes available about this particular spleenwort.

Remember, the best garden additions are plants you can grow successfully and that contribute positively to your local ecosystem – and that usually means choosing species with well-understood growing requirements and ecological roles.

Speenwort

Classification

Group

Fern

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision
Division

Pteridophyta - Ferns

Subdivision
Class

Filicopsida

Subclass
Order

Polypodiales

Family

Aspleniaceae Newman - Spleenwort family

Genus

Asplenium L. - spleenwort

Species

Asplenium caudatum G. Forst. - speenwort

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