North America Native Plant

Honolulu Lacefern

Botanical name: Ctenitis honolulensis

USDA symbol: CTHO

Life cycle: perennial

Habit: forb

Native status: Native to Hawaii  

Honolulu Lacefern: A Rare Native Hawaiian Fern Worth Knowing If you’re passionate about native Hawaiian plants, you may have heard whispers about the Honolulu lacefern (Ctenitis honolulensis). This perennial fern is one of Hawaii’s native treasures, though it remains somewhat mysterious even to dedicated plant enthusiasts. Let’s explore what makes ...

Rare plant alert!

Region: Conservation status by state

Status: S3?: Status is uncertain but is somewhere between the following rankings: Inexact rank: ⚘ 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 ⚘

Honolulu Lacefern: A Rare Native Hawaiian Fern Worth Knowing

If you’re passionate about native Hawaiian plants, you may have heard whispers about the Honolulu lacefern (Ctenitis honolulensis). This perennial fern is one of Hawaii’s native treasures, though it remains somewhat mysterious even to dedicated plant enthusiasts. Let’s explore what makes this fern special and whether it deserves a spot in your native Hawaiian garden.

What is the Honolulu Lacefern?

The Honolulu lacefern is a native Hawaiian fern species that belongs to the Ctenitis genus. As a perennial plant, it’s built to last through multiple growing seasons, making it a potentially valuable long-term addition to native landscapes. Despite its classification in some databases as a forb (a non-woody vascular plant), this is actually a true fern that adds the classic delicate, feathery texture that fern lovers adore.

Where Does It Grow?

This fern is exclusively native to Hawaii, making it a true island endemic. Its natural range is limited to the Hawaiian islands, where it has evolved to thrive in the unique climate and growing conditions found nowhere else on Earth.

A Word About Rarity

Here’s something important to know: the Honolulu lacefern has a conservation status of S3?, which indicates an undefined but potentially vulnerable status. This means we should approach this plant with extra care and respect. If you’re lucky enough to encounter this fern or find it available through specialized native plant sources, make absolutely sure you’re obtaining it from responsible, ethical suppliers who aren’t impacting wild populations.

Garden Benefits and Appeal

While specific details about the Honolulu lacefern’s appearance and growing habits are limited in available resources, native Hawaiian ferns generally offer several garden benefits:

  • They contribute to the authentic native ecosystem of Hawaiian landscapes
  • Ferns typically provide excellent texture contrast in shade gardens
  • Native plants support local wildlife and ecosystem health
  • They’re adapted to local climate conditions, potentially requiring less water and maintenance once established

Growing Challenges and Considerations

Unfortunately, detailed growing information for Ctenitis honolulensis is quite scarce. This lack of readily available cultivation guidance presents both challenges and opportunities for native plant enthusiasts. If you’re interested in growing native Hawaiian ferns, you might want to start with better-documented species while supporting research and conservation efforts for rarer ones like the Honolulu lacefern.

Should You Grow It?

The Honolulu lacefern presents an interesting case. As a native Hawaiian species, it would be a fantastic addition to authentic native landscapes. However, its unclear conservation status and limited availability mean you should proceed thoughtfully:

  • Only source plants from reputable native plant nurseries
  • Ensure any plants you purchase are propagated, not wild-collected
  • Consider supporting conservation efforts for Hawaiian native plants
  • Start with better-documented native Hawaiian ferns while learning more about this species

The Bigger Picture

The Honolulu lacefern represents something larger than just one garden plant—it’s part of Hawaii’s unique natural heritage. Whether or not you end up growing this specific fern, learning about native species like Ctenitis honolulensis helps us appreciate the incredible diversity of Hawaii’s endemic flora and the importance of protecting these botanical treasures for future generations.

If you’re passionate about native Hawaiian gardening, consider connecting with local botanical gardens, native plant societies, and conservation organizations. They may have more information about this elusive fern and can guide you toward other native species that are more readily available for home cultivation.

Honolulu Lacefern

Classification

Group

Fern

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision
Division

Pteridophyta - Ferns

Subdivision
Class

Filicopsida

Subclass
Order

Polypodiales

Family

Dryopteridaceae Herter - Wood Fern family

Genus

Ctenitis (C. Chr.) C. Chr. ex Tardieu-Blot & C. Chr. - lacefern

Species

Ctenitis honolulensis (Hook.) Copeland - Honolulu lacefern

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