North America Native Plant

Limahuli Valley Cyanea

Botanical name: Cyanea kuhihewa

USDA symbol: CYKU3

Life cycle: perennial

Habit: shrub

Native status: Native to Hawaii  

Limahuli Valley Cyanea: A Rare Hawaiian Treasure Worth Protecting If you’re passionate about native Hawaiian plants and conservation gardening, the Limahuli Valley cyanea (Cyanea kuhihewa) might just capture your heart. But before you get too excited about adding this stunning shrub to your garden, there’s something important you need to ...

Rare plant alert!

Region: United States

Status: SHC: Status is uncertain but is somewhere between the following rankings: Captive or Cultivated Only: Is presumed or is possibly extinct in the wild across their entire native range but exists in cultivation, either in captivity or naturalized outside their native range, or as a reintroduced population or ecosystem restoration that's not yet established. ⚘ Possibly Extinct: Known only from historical occurrences. Still some hope of rediscovery ⚘ Endangered: In danger of extinction throughout all or a significant portion of its range. ⚘

Region: United States

Limahuli Valley Cyanea: A Rare Hawaiian Treasure Worth Protecting

If you’re passionate about native Hawaiian plants and conservation gardening, the Limahuli Valley cyanea (Cyanea kuhihewa) might just capture your heart. But before you get too excited about adding this stunning shrub to your garden, there’s something important you need to know – this beautiful native is fighting for its survival.

What Makes This Plant Special?

The Limahuli Valley cyanea is a perennial shrub that belongs to Hawaii’s remarkable native flora. True to its shrub classification, this multi-stemmed woody plant typically grows less than 13-16 feet tall, making it a manageable size for most garden spaces. Like other members of the bellflower family, it likely produces distinctive tubular flowers that would make any garden visitor stop and take notice.

Where Does It Call Home?

This plant is exclusively native to Hawaii, with its very name honoring the Limahuli Valley on KauaÊ»i where it was discovered. You won’t find this species growing naturally anywhere else in the world – it’s what botanists call endemic, making it truly special to the Hawaiian Islands.

The Reality Check: Rarity Status

Here’s the crucial part: The Limahuli Valley cyanea is listed as Endangered in the United States. This means that if you’re considering growing this plant, you absolutely must source it responsibly. Never collect from the wild, and only obtain plants from reputable native plant nurseries or conservation programs that work with legally propagated material.

By choosing to grow this rare beauty, you’re not just adding an exotic plant to your garden – you’re becoming part of a conservation effort to keep this species from disappearing forever.

Garden Role and Design Potential

In the right setting, the Limahuli Valley cyanea can serve as a stunning focal point in native Hawaiian gardens or specialized conservation collections. Its shrub form makes it perfect for:

  • Creating natural-looking native plant groupings
  • Adding vertical interest to tropical landscapes
  • Serving as a conversation starter about Hawaiian conservation
  • Supporting native ecosystem restoration efforts

Growing Conditions and Care

This plant’s wetland status tells us it’s quite adaptable – it can thrive in both wetland and non-wetland conditions. However, being a tropical Hawaiian native, it will need:

  • USDA hardiness zones 10-12 (essentially frost-free conditions)
  • High humidity and consistent moisture
  • Protection from strong winds
  • Partial shade to filtered sunlight
  • Well-draining but moisture-retentive soil

Think of recreating the lush, humid conditions of a Hawaiian valley – that’s the sweet spot for this plant.

Supporting Local Wildlife

While specific pollinator information isn’t widely documented, Cyanea species are typically important to Hawaii’s native ecosystem. By growing this plant, you’re likely supporting native Hawaiian birds and insects that have co-evolved with these unique species over thousands of years.

Should You Grow It?

The answer is a cautious yes – but only if you can commit to responsible sourcing and proper care. This isn’t a plant for casual gardeners or those looking for low-maintenance options. However, if you’re passionate about conservation, have experience with tropical plants, and can provide the specific conditions it needs, growing the Limahuli Valley cyanea can be incredibly rewarding.

Remember, by successfully growing this endangered species, you’re not just creating a beautiful garden – you’re helping preserve a piece of Hawaii’s irreplaceable natural heritage for future generations.

The Bottom Line

The Limahuli Valley cyanea represents both the beauty and fragility of Hawaii’s native flora. While it requires dedication and specific growing conditions, the opportunity to nurture an endangered species in your own garden is truly special. Just remember: always source responsibly, provide excellent care, and take pride in being part of this plant’s conservation story.

Limahuli Valley Cyanea

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

Cyanea Gaudich. - cyanea

Species

Cyanea kuhihewa Lammers - Limahuli Valley cyanea

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