The arundina graminifolia bamboo orchid is the only species in the genus Arundina. It grows tall, grass like canes topped with pink and purple flowers that resemble small Cattleyas. Native to Southeast Asia and the Himalayan foothills, it now grows as a garden plant far beyond that range.
What Is the Arundina Graminifolia Bamboo Orchid?
Arundina graminifolia is a terrestrial orchid, meaning it grows rooted in soil rather than on bark or moss. The canes are reed like and can reach 6 feet in the right conditions. Each cane carries narrow, grass like leaves along its length, which is where the common name comes from.
Flowers open from the cane tips in clusters of two to six blooms per stem. They resemble small Cattleya flowers, usually pink to purple with a darker lip.
This species belongs to the broader group of ground orchids. Our guide to ground orchids covers that wider category of terrestrial growers.
Bamboo Orchid Plant Care Quick Reference
| Factor | What Arundina Graminifolia Needs |
|---|---|
| Light | Full sun to very bright light |
| Water | Heavy and frequent during active growth |
| Soil | Rich, fast draining terrestrial mix |
| Hardiness | USDA zones 10 to 11 outdoors |
| Bloom season | Nearly year round in warm climates |
| Flower color | Pink to purple, sometimes near white |
A purple bamboo orchid with deep magenta flowers is the most common form growers find. Paler pink and near white forms exist too, though they are less widely sold.
Where the Bamboo Orchid Plant Grows Naturally and Where It Has Escaped
The native range runs from the Himalayas through Southeast Asia. Growers have moved it around the tropics for over a century because it is easy and showy.
That ease of growth has a downside. Arundina graminifolia has naturalized in Hawaii, Puerto Rico, and other warm regions. Wind blown seed lets it spread into disturbed ground and forest edges.
In parts of Hawaii it is treated as an invasive plant. It can crowd out native vegetation once it gets established.
If you garden in a tropical or subtropical climate, check local guidance before planting it outdoors. A responsible grower deadheads spent flowers before seed pods form, which limits unwanted spread.
Growing the Bamboo Orchid Outdoors
Outdoors, this orchid wants full sun for most of the day. It also wants a rich, fast draining bed, since standing water rots the roots quickly.
Water it heavily during active growth, more like a tropical perennial than a typical potted orchid. The canes and roots tolerate regular soaking as long as excess water drains away within minutes.
USDA zones 10 to 11 suit it as a permanent garden plant. Our page on whether orchids can live outside walks through which types tolerate outdoor conditions year round.
Hawaiian Orchid Care Conditions and Why They Suit This Species
Hawaiian orchid care for this species barely needs adjusting from its native habitat. Warm nights, steady rain, and bright sun match the conditions Arundina graminifolia already prefers.
That close match is part of why it naturalized so readily across the islands. Gardeners in similar frost free climates can expect the same easy, fast growing habit.
Buying an Arundina Orchid Plant
When shopping for a bamboo orchid for sale, look for firm, green canes with healthy roots. Avoid plants with soft, blackened cane bases, which often signal rot.
A young division may not bloom in its first year. Established clumps with several mature canes are more likely to flower soon after you bring them home.
Growing It in a Container Outside Its Hardy Zones
Gardeners in cooler climates grow the bamboo orchid plant in a large pot instead. Use a rich, well draining terrestrial mix rather than straight orchid bark.
Move the pot outdoors for summer, then bring it inside before nights drop near 50 F (10 C). A bright window or sunroom keeps it growing through winter, though flowering usually slows.
Blooming Habits of the Bamboo Orchid Plant
In warm, frost free climates, arundina graminifolia bamboo orchid plants bloom on and off through most of the year. New flowers open from the tips of the canes as they mature.
Older canes that have already flowered will not rebloom from the same tip. New growth from the base is what produces the next round of flowers.
How to Propagate Bamboo Orchid Canes
Bamboo orchids offer three easy propagation paths, which is unusual for orchids in general. Older canes often produce keikis, small plantlets with their own roots and leaves.
Once a keiki has a few roots of its own, cut it free and pot it separately. Our guide to orchid keikis explains how to tell when a plantlet is ready to remove.
Division is the second option. Clumps that have grown large can be split apart at the base. Keep several canes and a healthy root mass in each section.
Seed is the third path, though it works differently than with most orchids. Arundina graminifolia self sows readily in warm gardens, and seedlings often appear on their own near the parent plant.
For a broader look at propagation methods across orchid genera, see our guide on how to propagate orchids.
Pruning Old Canes
Cut back canes once they have finished flowering and turned brown or woody. This keeps the clump tidy and redirects energy into new growth.
Leave healthy green canes in place even if they are not currently blooming. They may flower again from new growth points lower down.
Pests That Affect Arundina Graminifolia
Scale insects and spider mites are the most common problems on bamboo orchid plants. Scale shows up as small, waxy bumps along the canes and under leaves.
Spider mites cause fine stippling on leaves and thrive in dry, dusty conditions. Regular rinsing of the foliage helps keep both pests from building up.
Bamboo Orchid vs Epidendrum: How to Tell Them Apart
People often confuse the arundina graminifolia bamboo orchid with reed stem Epidendrum orchids. Both have tall canes and clustered flowers. The two are not closely related, and a few features separate them reliably.
| Feature | Bamboo Orchid (Arundina) | Reed Stem Epidendrum |
|---|---|---|
| Growth habit | Terrestrial, rooted in soil | Terrestrial or epiphytic |
| Leaves | Grass like, along the full cane | Narrower, more widely spaced |
| Flower position | Cluster at the very tip only | Rounded cluster at the tip, often continuous |
| Species count | Only one species in the genus | Hundreds of species and hybrids |
If you are trying to identify a tall, cane like orchid, our Epidendrum orchid guide can help. It covers that genus in detail. Between the two, arundina graminifolia is the one with a single species and a stronger Cattleya like flower shape.
Where Bamboo Orchid Fits Among Orchid Types
Arundina graminifolia sits in a small corner of a very large family. Our overview of types of orchids compares terrestrial, epiphytic, and other growth habits. It is a good place to see the wider picture.
Knowing where this species fits helps explain why its care differs so much from a windowsill Phalaenopsis. It behaves more like a garden perennial than a typical houseplant orchid.
Sources
- Clemson Cooperative Extension, Home and Garden Information Center: Orchids, factsheet. https://hgic.clemson.edu/factsheet/orchids/
- Internet Orchid Species Photo Encyclopedia: Arundina graminifolia species page. https://www.orchidspecies.com/arundinagraminifolia.htm
- Internet Orchid Species Photo Encyclopedia: Epidendrum radicans species page. https://www.orchidspecies.com/epiradicans.htm
Frequently asked questions
Is the bamboo orchid invasive?
Arundina graminifolia has naturalized and become invasive in parts of Hawaii, Puerto Rico, and other warm regions. Check local guidance before planting it outdoors in tropical climates.
How cold hardy is Arundina graminifolia?
It survives outdoors year round in USDA zones 10 to 11. Elsewhere, grow it in a container and bring it inside before nights drop near 50 F (10 C).
How do you propagate a bamboo orchid?
Bamboo orchids propagate from keikis, division of large clumps, or self sown seed. Keikis root on old canes and can be cut free once established.
Why is my bamboo orchid not blooming?
Older canes that already flowered will not rebloom from the same tip. New flowers come from fresh canes, so check for new growth at the base.
What is the difference between Arundina and Epidendrum?
Arundina graminifolia is the only species in its genus, while Epidendrum includes hundreds of species. Arundina flowers only at the very tip of each cane.