Asystasia: A Tropical Ground Cover for Pacific Gardens
If you’re gardening in the tropical Pacific and looking for a reliable ground cover that produces delicate purple flowers, you might want to get acquainted with asystasia (Asystasia nemorum). This perennial plant has quietly made itself at home in places like Guam and Palau, where it’s become a common sight in shaded areas and forest edges.
What is Asystasia?
Asystasia nemorum, commonly known simply as asystasia, is a low-growing perennial that originally hails from Southeast Asia, particularly Malaysia and Indonesia. You might also see it listed under its synonym, Asystasia blumei. This modest little plant has adapted well to life in the Pacific Basin, where it reproduces on its own and has become a naturalized part of the landscape.
Where You’ll Find It Growing
Currently, asystasia has established populations in Guam and Palau, where it thrives in the warm, humid tropical climate. As a non-native species that reproduces spontaneously, it’s found a comfortable niche in these Pacific island ecosystems.
What Does Asystasia Look Like?
Don’t expect anything too flashy from asystasia – its beauty lies in its understated charm. The plant produces small, tubular purple or violet flowers that add subtle color to shaded garden areas. Its green foliage creates a carpet-like effect, making it useful as a ground cover in tropical landscapes.
Should You Grow Asystasia?
Whether asystasia is right for your garden depends on your goals and location. Here are some considerations:
The Case for Growing It
- Easy care and low maintenance once established
- Provides ground cover in shaded areas where other plants might struggle
- Small flowers can attract pollinators like bees and butterflies
- Well-adapted to tropical Pacific climates
- Perennial nature means it comes back year after year
Things to Keep in Mind
- As a non-native species, it won’t support local wildlife ecosystems as effectively as native plants
- Limited to very warm climates (USDA zones 10-12 only)
- Can spread readily, so may need management in smaller gardens
How to Grow Asystasia Successfully
If you decide asystasia fits your garden plans, here’s what you need to know about growing it:
Growing Conditions
- Light: Shade to partial shade – this plant prefers protection from intense tropical sun
- Soil: Moist, well-draining soil works best
- Climate: Warm tropical conditions year-round (zones 10-12)
- Water: Regular watering, but avoid waterlogged conditions
Planting and Care Tips
- Plant in areas where you want naturalized ground cover
- Minimal fertilization needed – this plant isn’t particularly demanding
- Monitor its spread if you want to contain it to specific areas
- Works well in understory plantings beneath larger tropical plants
Consider Native Alternatives
While asystasia can certainly serve a purpose in Pacific gardens, you might also want to explore native ground covers that would better support local wildlife and ecosystems. Check with local native plant societies or extension offices in Guam and Palau for recommendations on indigenous species that could fill similar roles in your landscape.
The Bottom Line
Asystasia nemorum is a reliable, easy-going ground cover for tropical Pacific gardens. It’s not going to be the star of your landscape, but it can certainly play a supporting role in shaded areas where you need something dependable. Just remember that choosing native plants when possible helps support the unique ecosystems of these beautiful Pacific islands.
