Cyrtococcum oxyphyllum: A Hidden Gem of Pacific Island Grasses
If you’re gardening in the tropical Pacific and looking for authentic native plants, you might want to get acquainted with Cyrtococcum oxyphyllum. This unassuming grass might not have a catchy common name, but it’s got some serious native credentials that make it worth considering for your landscape.



What Exactly Is Cyrtococcum oxyphyllum?
This plant is a true grass species that calls the Pacific Basin home. You’ll find it naturally growing in Guam and Palau, where it has been quietly doing its grassy thing for who knows how long. As a member of the grass family, it has that classic narrow-leaved look that blends beautifully into naturalistic plantings.
Where Does It Come From?
Cyrtococcum oxyphyllum is native to the Pacific Basin, though interestingly, it’s not found in Hawaii. Its documented range includes Guam and Palau, making it a truly Pacific island native. If you’re gardening in these areas, you’re looking at a plant that belongs in your local ecosystem.
Why You Might Want to Plant It
Here’s where this humble grass starts to shine:
- It’s genuinely native: Supporting local ecosystems is always a win
- Low maintenance: Native plants typically require less fussing once established
- Versatile growing conditions: This grass can handle both wetlands and drier spots, thanks to its facultative wetland status
- Natural look: Perfect for creating authentic Pacific island landscapes
Garden Design and Landscape Role
Cyrtococcum oxyphyllum works wonderfully as a ground cover or accent grass in native plant gardens. It’s particularly well-suited for:
- Native Pacific island garden designs
- Naturalistic landscapes
- Areas where you want that authentic wild Pacific island feel
- Mixed native plantings where it can provide textural contrast
Growing Conditions and Care
The beauty of native plants is that they’re already adapted to local conditions. Based on its facultative wetland status, this grass is pretty flexible about moisture levels. Here’s what it likely prefers:
- Light: Partial shade to full sun
- Soil: Adaptable to various soil types, from moist to moderately dry
- USDA Zones: 10-12 (tropical zones)
- Maintenance: Minimal once established
Planting and Care Tips
Since specific growing information for this species is limited, follow these general guidelines for Pacific native grasses:
- Plant during the rainy season for best establishment
- Water regularly until established, then let natural rainfall take over
- Avoid over-fertilizing – native plants usually don’t need it
- Allow it to self-seed naturally for a more authentic look
Wildlife and Ecological Benefits
While we don’t have specific data on wildlife interactions with Cyrtococcum oxyphyllum, native grasses generally provide:
- Habitat and cover for small wildlife
- Seeds for birds and other creatures
- Root systems that help prevent soil erosion
- Support for local ecosystem balance
Should You Plant It?
If you’re gardening in Guam, Palau, or similar Pacific island environments, absolutely consider it! This grass offers the satisfaction of growing something truly native to your area. It’s not flashy or dramatic, but sometimes the quiet, steady performers are exactly what a landscape needs.
The main challenge might be finding it at your local nursery, since it’s not exactly a mainstream garden plant. You might need to connect with native plant societies or specialty growers who focus on indigenous Pacific species.
For gardeners outside its native range, you’d be better served by choosing grasses native to your specific area. Every region has its own wonderful native grass species that will be better adapted to local conditions and more beneficial to local wildlife.
The Bottom Line
Cyrtococcum oxyphyllum might not win any beauty contests or have an Instagram-worthy name, but for Pacific island gardeners interested in authentic native landscaping, it’s definitely worth tracking down. It’s the kind of plant that quietly does its job, supports local ecosystems, and helps create landscapes that truly belong to their place.