North America Native Plant

Spleenwort

Botanical name: Asplenium ×flagrum

USDA symbol: ASFL7

Life cycle: perennial

Habit: forb

Native status: Native to Hawaii  

The Mysterious Hawaiian Spleenwort: A Rare Island Treasure Meet Asplenium ×flagrum, a fascinating and elusive member of the spleenwort family that calls Hawaii home. This intriguing fern represents one of nature’s quiet mysteries – a hybrid species that few gardeners have ever encountered, let alone grown in their landscapes. What ...

The Mysterious Hawaiian Spleenwort: A Rare Island Treasure

Meet Asplenium ×flagrum, a fascinating and elusive member of the spleenwort family that calls Hawaii home. This intriguing fern represents one of nature’s quiet mysteries – a hybrid species that few gardeners have ever encountered, let alone grown in their landscapes.

What Makes This Spleenwort Special?

The × in this fern’s name tells us we’re dealing with something unique – a natural hybrid that emerged from the crossbreeding of two different Asplenium species in Hawaii’s diverse ecosystems. As a perennial fern, it’s built to last, quietly persisting in its native Hawaiian habitats year after year.

Where You’ll Find This Hawaiian Native

This spleenwort is exclusively native to Hawaii, making it a true island endemic. You won’t find this particular hybrid growing wild anywhere else in the world – it’s as Hawaiian as it gets when it comes to ferns.

Garden Habitat Preferences

Based on its wetland status classification as Facultative Upland, this spleenwort seems to prefer life on the drier side of things. It typically grows in non-wetland areas but can occasionally tolerate some moisture. This suggests it might appreciate well-draining conditions if you’re lucky enough to encounter it in cultivation.

The Reality Check for Gardeners

Here’s where things get interesting (and a bit challenging) for enthusiastic native plant gardeners. Asplenium ×flagrum is remarkably rare in cultivation and gardening literature. In fact, detailed growing information for this specific hybrid is practically non-existent in mainstream horticultural resources.

This rarity could mean several things:

  • It may be extremely difficult to propagate or maintain in cultivation
  • It might be naturally rare in the wild, making collection inappropriate
  • It could be so specialized to Hawaiian conditions that it doesn’t adapt well to typical garden settings
  • It simply hasn’t been studied or cultivated extensively by gardeners and botanists

Should You Try to Grow It?

If you’re a Hawaii resident passionate about native plants, this spleenwort represents the ultimate gardening challenge. However, given the lack of available information about cultivation requirements, success would likely require significant experimentation and potentially collaboration with local botanists or native plant societies.

For mainland gardeners, this species would be completely inappropriate, as it’s adapted specifically to Hawaiian conditions and ecosystems.

Better Alternatives for Spleenwort Lovers

If you’re drawn to the charm of spleenworts but want something more garden-friendly, consider looking into other Asplenium species that are better documented and more readily available in cultivation. Many regions have their own native spleenwort species that would be more appropriate and successful choices for native plant gardens.

The Takeaway

Asplenium ×flagrum serves as a beautiful reminder of nature’s complexity and the incredible diversity found in Hawaii’s unique ecosystems. While it may not be destined for your garden bed, it represents the kind of botanical treasure that makes Hawaii’s flora so special. Sometimes the most valuable plants are the ones we can simply appreciate from afar, knowing they’re thriving in their perfect natural homes.

Wetland Status

The rule of seasoned gardeners and landscapers is to choose the "right plant for the right place" matching plants to their ideal growing conditions, so they'll thrive with less work and fewer inputs. But the simplicity of this catchphrase conceals how tricky plant selection is. While tags list watering requirements, there's more to the story.

Knowing a plant's wetland status can simplify the process by revealing the interaction between plants, water, and soil. Surprisingly, many popular landscape plants are wetland species! And what may be a wetland plant in one area, in another it might thrive in drier conditions. Also, it helps you make smarter gardening choices and grow healthy plants with less care and feeding, saving you time, frustration, and money while producing an attractive garden with greater ecological benefits.

Regions
Status
Moisture Conditions

Hawaii

FACU

Facultative Upland - Plants with this status usually occurs in non-wetlands but may occur in wetlands

Spleenwort

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 ×flagrum W.H. Wagner & D.D. Palmer [hobdyi × normale] - spleenwort

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