North America Native Plant

Bog Clermontia

Botanical name: Clermontia grandiflora maxima

USDA symbol: CLGRM2

Life cycle: perennial

Habit: shrub

Native status: Native to Hawaii  

Bog Clermontia: A Rare Hawaiian Native Worth Protecting If you’re passionate about Hawaiian native plants, you may have come across the intriguing bog clermontia (Clermontia grandiflora maxima). This rare perennial shrub represents one of Hawaii’s unique botanical treasures, though it comes with some important considerations for the home gardener. What ...

Rare plant alert!

Region: Conservation status by state

Status: S3T1?: Status is uncertain but is somewhere between the following rankings: Inexact rank: ⚘ Subspecies or variety is critically Imperiled: Extremely rare due to factor(s) making it especially vulnerable to extinction. Typically 5 or fewer occurrences or very few remaining individuals (<1,000) ⚘ 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 ⚘

Bog Clermontia: A Rare Hawaiian Native Worth Protecting

If you’re passionate about Hawaiian native plants, you may have come across the intriguing bog clermontia (Clermontia grandiflora maxima). This rare perennial shrub represents one of Hawaii’s unique botanical treasures, though it comes with some important considerations for the home gardener.

What Makes Bog Clermontia Special?

Bog clermontia is a native Hawaiian shrub that belongs to the diverse Clermontia genus, a group of plants found nowhere else on Earth. As a perennial, multi-stemmed woody plant, it typically grows to less than 13-16 feet in height, though it can sometimes reach greater heights or develop a single stem depending on environmental conditions.

This species is exclusively native to the Hawaiian Islands, where it has evolved over thousands of years to thrive in the unique island ecosystem.

The Rarity Factor: Why This Matters to Gardeners

Here’s where things get serious: bog clermontia has a Global Conservation Status of S3T1?, which indicates significant rarity concerns. This classification means that if you’re considering adding this plant to your garden, you need to be extra thoughtful about your approach.

The rarity of this species means:

  • It may be difficult or impossible to find in regular nurseries
  • Any planting should only be done with responsibly sourced material
  • Conservation of existing populations takes priority over cultivation

Growing Bog Clermontia: What We Know (and Don’t Know)

Unfortunately, detailed growing information for this specific variety is quite limited due to its rarity. What we do know is that as a Hawaiian native, it likely thrives in USDA hardiness zones 10-11, making it suitable primarily for tropical and subtropical climates.

For gardeners in Hawaii or similar climates who are determined to grow this species, here are some general guidelines based on other Clermontia species:

  • Provide partial shade to filtered sunlight
  • Ensure well-draining but consistently moist soil
  • Protect from strong winds
  • Maintain high humidity levels

Should You Plant Bog Clermontia?

The short answer is: proceed with extreme caution and responsibility. If you’re passionate about supporting Hawaiian native plant conservation, consider these alternatives:

  • Support conservation organizations working to protect wild populations
  • Choose other native Hawaiian plants that are more readily available and less threatened
  • If you do source bog clermontia, ensure it comes from legitimate conservation programs or licensed native plant nurseries

The Bottom Line

Bog clermontia represents the fascinating but fragile nature of Hawaii’s endemic flora. While its rarity makes it a challenging choice for home gardeners, it serves as an important reminder of why native plant conservation matters. If you’re drawn to unique Hawaiian natives, consider exploring more common species first while supporting efforts to protect rare gems like bog clermontia in their natural habitats.

Remember, sometimes the best way to appreciate a rare plant is to help ensure it survives in the wild for future generations to discover and admire.

Bog Clermontia

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Asteridae

Order

Campanulales

Family

Campanulaceae Juss. - Bellflower family

Genus

Clermontia Gaudich. - clermontia

Species

Clermontia grandiflora Gaudich. - bog clermontia

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