Non-native Plants

Star Orchid

Epidendrum ×obrienianum

USDA symbol: EPOB2

perennial forb

Hawaii: non-native, naturalized

If you’ve stumbled across the star orchid (Epidendrum ×obrienianum) in your plant research, you might be wondering what exactly this orchid brings to the garden table. This perennial orchid hybrid has made itself at home in Hawaii, though it’s not a native species to the islands. Let’s dive into what ...

Star Orchid: A Mysterious Hybrid Orchid for Tropical Gardens

If you’ve stumbled across the star orchid (Epidendrum ×obrienianum) in your plant research, you might be wondering what exactly this orchid brings to the garden table. This perennial orchid hybrid has made itself at home in Hawaii, though it’s not a native species to the islands. Let’s dive into what makes this orchid tick and whether it deserves a spot in your landscape.

What Exactly Is the Star Orchid?

The star orchid is classified as a forb – essentially a non-woody perennial plant that keeps its growing points at or below ground level. Don’t let the fancy botanical jargon fool you; this simply means it’s an herbaceous plant that comes back year after year without developing a woody stem like trees or shrubs.

As a hybrid orchid (indicated by the × in its scientific name), the star orchid represents a cross between different Epidendrum species, though the exact parentage of this particular hybrid isn’t widely documented.

Where You’ll Find Star Orchids

Currently, star orchids have established populations in Hawaii, where they’ve managed to reproduce and persist in the wild without human intervention. This makes them what botanists call naturalized – they’re non-native plants that have successfully adapted to their new environment.

  • Species observed
  • No observations

Garden Potential and Considerations

Here’s where things get a bit tricky with star orchids. While they’ve proven they can thrive in Hawaiian conditions, detailed information about their specific growing requirements, mature size, and garden performance is surprisingly limited. This lack of readily available cultivation information might give gardeners pause.

What we do know is that in Hawaii, star orchids prefer upland conditions – they typically grow in non-wetland areas but can occasionally tolerate wetter conditions. This suggests they appreciate well-draining soil rather than consistently soggy conditions.

Growing Conditions and Care

Based on their wetland status and their success in Hawaii, star orchids likely prefer:

  • Well-draining soil conditions
  • Upland or elevated growing sites
  • Tropical to subtropical climates
  • Protection from extreme weather conditions

However, specific details about light requirements, soil pH preferences, watering needs, and fertilization requirements for this particular hybrid remain unclear in available documentation.

The Native Alternative Angle

Since star orchids aren’t native to any U.S. region, gardeners interested in supporting local ecosystems might want to consider native orchid alternatives. While we don’t have evidence that star orchids are invasive or problematic, choosing native plants generally provides better support for local wildlife and pollinators.

For tropical and subtropical gardens, researching native orchid species in your area could provide similar aesthetic appeal while supporting local biodiversity.

The Bottom Line on Star Orchids

Star orchids present an interesting case study in the gardening world – they’re established in Hawaii and appear to be well-adapted, but detailed growing information remains elusive. This might make them more suitable for experienced orchid growers who don’t mind some trial and error.

If you’re drawn to orchids for your landscape, consider starting with better-documented species or native alternatives that come with clearer growing guidelines and known benefits to local ecosystems. However, if you’re an adventurous gardener in a suitable climate zone and happen to find star orchids available, they could be worth experimenting with in your collection.

Just remember – successful gardening often comes down to choosing plants that are well-suited to your specific conditions and that you can properly care for. With limited growing information available, star orchids might be better left to orchid specialists rather than general gardeners.

Wetland Status

The rule of seasoned gardeners and landscapers is to choose the "right plant for the right place" — matching plants to their ideal growing conditions, so they'll thrive with less care and fewer inputs. But the simplicity of this catchphrase conceals how tricky plant selection can be if you don't have the right information. While tags on nursery plants list watering requirements, there's more to the story.

Knowing a plant's wetland status can simplify the process by revealing the interaction between plants, water, and soil. You might be surprised to learn that popular landscape plants are wetland species! And what may be a wetland plant in one area, in another it might thrive in drier conditions. The table below gives insight into the preferred growing conditions of this plant throughout its geographical distribution.

Region
Preferred Habitat

Hawaii ()

Facultative Upland
Wetland Glossary
Obligate Wetland
Facultative Wetland
Facultative
Facultative Upland
Obligate Upland
Almost always occurs in wetlands
Usually occurs in wetlands but may occur in non-wetlands
Can occur in wetlands and non-wetlands
Usually occurs in non-wetlands but may occur in wetlands
Almost never occurs in wetlands

Classification

Group: Monocot
Kingdom: Plantae - Plants
Subkingdom: Tracheobionta - Vascular plants
Superdivision: Spermatophyta - Seed plants
Division: Magnoliophyta - Flowering plants
Class: Liliopsida - Monocotyledons
Subclass: Liliidae
Order: Orchidales
Family: Orchidaceae Juss. - Orchid family
Genus: Epidendrum L. - star orchid

Species: Epidendrum ×obrienianum Rolfe [evectum × ibaguense] - star orchid

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