North America Native Plant

Hawai’i Bristle Fern

Botanical name: Trichomanes draytonianum

USDA symbol: TRDR

Life cycle: perennial

Habit: forb

Native status: Native to Hawaii  

Synonyms: Vandenboschia draytonianum (Brack.) Copel. (VADR)   

Hawai’i Bristle Fern: A Rare Treasure for the Dedicated Gardener Meet the Hawai’i bristle fern (Trichomanes draytonianum), one of nature’s most delicate and ethereal creations. This remarkable fern isn’t your typical garden variety plant – it’s a rare gem that brings a touch of tropical magic to the right growing ...

Rare plant alert!

Region: Conservation status by state

Status: S3: 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 ⚘

Hawai’i Bristle Fern: A Rare Treasure for the Dedicated Gardener

Meet the Hawai’i bristle fern (Trichomanes draytonianum), one of nature’s most delicate and ethereal creations. This remarkable fern isn’t your typical garden variety plant – it’s a rare gem that brings a touch of tropical magic to the right growing conditions. But before you fall head over heels for this beauty, there are some important things every gardener should know.

What Makes This Fern Special

The Hawai’i bristle fern belongs to the fascinating world of filmy ferns, and boy, does it live up to that name! This perennial beauty creates translucent, almost see-through fronds that seem to shimmer in filtered light. Unlike the robust ferns you might be familiar with, this species has an almost gossamer quality that makes it look like something straight out of a fairy tale.

Botanically speaking, you might also see this fern listed under its synonym Vandenboschia draytonianum, but don’t let the name confusion fool you – we’re talking about the same enchanting plant.

A True Hawaiian Native

This fern is as Hawaiian as it gets – it’s endemic to the Hawaiian Islands and found nowhere else in the world naturally. Talk about island exclusivity! In its native habitat, you’ll find it thriving in the lush, humid environments of Hawaii’s wet forests.

The Conservation Reality Check

Here’s where things get serious, fellow plant lovers. The Hawai’i bristle fern carries a Global Conservation Status of S3, which means it’s considered vulnerable. With only an estimated 21 to 100 occurrences or between 3,000 to 10,000 individuals remaining, this isn’t a plant to take lightly.

If you’re considering adding this rare beauty to your collection, please – and we cannot stress this enough – only source it from reputable suppliers who practice responsible propagation. Wild collection of this species could push it closer to extinction.

Is This Fern Right for Your Garden?

Let’s be honest – the Hawai’i bristle fern isn’t for everyone. This is definitely a plant for the dedicated specialist rather than the casual gardener. Here’s what you need to know:

Perfect Conditions

  • Climate: USDA hardiness zones 10-12 only (think tropical and subtropical)
  • Humidity: Extremely high humidity requirements
  • Light: Filtered, indirect light – direct sun is a no-go
  • Moisture: Consistently moist conditions (it has a facultative wetland status)

Ideal Growing Situations

  • Specialized terrariums or conservatories
  • Tropical shade gardens with excellent humidity control
  • Bog gardens or areas near water features
  • Protected outdoor spaces in tropical climates

Garden Design Role

When successfully grown, the Hawai’i bristle fern serves as a stunning accent plant that creates an almost mystical atmosphere. Its translucent fronds catch and filter light in ways that few other plants can match. Think of it as the jewelry of the fern world – small, precious, and absolutely captivating when properly displayed.

This fern works beautifully as part of a collection focused on rare or unusual species, and it’s particularly striking when grown alongside other filmy ferns or in settings that highlight its unique translucent quality.

The Bottom Line for Gardeners

Should you grow the Hawai’i bristle fern? If you’re an experienced tropical gardener with the right conditions and a commitment to conservation, absolutely – but only with responsibly sourced plants. This isn’t a beginner’s plant, and it’s definitely not something you can just stick in any old corner of your garden.

For most gardeners, especially those outside of tropical zones, this fern is better admired in botanical conservatories or specialized collections. However, if you have the expertise, the right environment, and access to ethically sourced specimens, growing this rare beauty can be an incredibly rewarding way to participate in plant conservation.

Remember, every successfully cultivated rare plant is a small victory for conservation – just make sure you’re doing it right!

Hawai’i Bristle Fern

Classification

Group

Fern

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision
Division

Pteridophyta - Ferns

Subdivision
Class

Filicopsida

Subclass
Order

Polypodiales

Family

Hymenophyllaceae Mart. - Filmy Fern family

Genus

Trichomanes L. - bristle fern

Species

Trichomanes draytonianum Brack. - Hawai'i bristle fern

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