Mt. Kahili Colicwood: A Rare Hawaiian Native Worth Protecting
If you’re passionate about native Hawaiian plants and have the right growing conditions, Mt. Kahili colicwood might just be the unique shrub your garden has been waiting for. But before you start planning where to plant it, there’s something important you need to know about this special endemic species.
What is Mt. Kahili Colicwood?
Mt. Kahili colicwood (Myrsine wawraea) is a perennial shrub that’s as Hawaiian as it gets – this little beauty is found nowhere else on Earth except the Hawaiian Islands. Also known by its synonym Myrsine st.-johnii, this multi-stemmed woody plant typically stays under 13-16 feet tall, making it a perfect size for many landscape applications.
As a true shrub, it develops several stems from near the ground, creating a naturally bushy appearance that fits beautifully into native Hawaiian garden designs.
Where Does It Grow?
This endemic Hawaiian species calls the islands home, with a particular fondness for the cooler, wetter areas. You’ll find it naturally occurring only in Hawaii, where it has adapted to the unique island ecosystem over thousands of years.
A Plant That Needs Our Help
Here’s where things get serious: Mt. Kahili colicwood has a Global Conservation Status of S3, meaning it’s considered vulnerable. With only 21 to 100 occurrences and an estimated 3,000 to 10,000 individuals remaining in the wild, this isn’t your everyday garden shrub.
What this means for gardeners: If you’re lucky enough to grow this plant, make absolutely sure you’re getting it from a reputable, responsible source that doesn’t harvest from wild populations. Think of yourself as a conservation partner rather than just a gardener!
Growing Conditions and Care
Mt. Kahili colicwood has some specific preferences that reflect its native Hawaiian habitat:
- Water needs: As a facultative wetland plant, it usually thrives in wet conditions but can tolerate some drier periods
- USDA Hardiness Zones: 10-11 (tropical and subtropical climates only)
- Light requirements: Partial shade to full sun, though it naturally grows in understory conditions
- Soil: Prefers consistently moist to wet soils with good organic content
Perfect for the Right Garden
This shrub shines in:
- Native Hawaiian restoration gardens
- Naturalistic landscapes that mimic native ecosystems
- Rain gardens and areas with consistent moisture
- Understory plantings beneath taller native trees
- Conservation-focused landscapes
Planting and Care Tips
If you’re in the right climate zone and have found a responsibly sourced plant:
- Plant in organically rich, well-draining but moisture-retentive soil
- Mulch around the base to help retain moisture and suppress weeds
- Water regularly, especially during establishment
- Minimal pruning needed – let it develop its natural form
- Consider companion planting with other native Hawaiian species
Wildlife and Ecosystem Benefits
While specific wildlife benefits aren’t well-documented, native Hawaiian plants like Mt. Kahili colicwood play crucial roles in supporting endemic insects and maintaining the delicate balance of island ecosystems. By growing this plant responsibly, you’re contributing to the preservation of Hawaii’s unique natural heritage.
Should You Plant It?
The answer depends entirely on your location and commitment level. If you’re in USDA zones 10-11 and can provide the moist conditions this plant craves, and – most importantly – if you can source it responsibly, then absolutely yes! You’ll be doing your part to keep this vulnerable species alive while enjoying a truly unique piece of Hawaiian natural history.
However, if you’re outside the appropriate climate zones or can’t find responsibly sourced plants, consider supporting Hawaiian plant conservation efforts in other ways, or explore other native plants suitable for your region.
Remember: with great plants comes great responsibility, especially when they’re as rare and special as Mt. Kahili colicwood!
