Types of Orchids: Terrestrial vs. Epiphytic Explained

Despite thousands of species and tens of thousands of hybrids, all orchids fall into just two fundamental growth types: terrestrial (ground-growing) and epiphytic (tree/rock-growing). Understanding this distinction is key to successful cultivation.

Terrestrial Orchids

These grow with roots in soil or potting media, like most conventional plants. The popular Cymbidium orchid—among the first cultivated—exemplifies this group. With 40 species and thousands of hybrids, Cymbidiums adapt remarkably well, growing in soil, on rocks, or in decaying wood. Native to East Asia (Japan to Southeast Asia and Australia), they're forgiving for beginners and reward with spectacular annual blooms.

Some terrestrials are "semi-terrestrial," possessing both underground and aerial roots.

Epiphytic Orchids

Epiphytes grow with roots exposed to air, attaching to tree bark, rocks, or other structures—never parasitizing their hosts. They capture organic debris and moisture in their specialized roots. The Dendrobium genus (1,000+ species) represents this type, native to Australia, Polynesia, Southeast Asia, and northern India. They prefer warmth and humidity but require more attention than Cymbidiums.

The Phalaenopsis (moth orchid) is another beloved epiphyte—easy to grow with long-lasting flowers in diverse colors and patterns, making it a wedding favorite.

Epiphytic Root Adaptations

Epiphytic roots feature a tough, stringy core surrounded by a spongy, off-white velamen that rapidly absorbs water during rain, turning green when saturated. This velamen then releases moisture gradually to plant tissues, preventing rot while sustaining the plant through dry periods.

Rock-Dwelling Epiphytes

Some epiphytes (lithophytes) cling to rocks, thriving in filtered light and airy conditions similar to their tree-dwelling cousins.

Home Growing Success

By mimicking natural conditions—bright indirect light, humidity, airy media, and careful watering—you can grow both types successfully indoors for years of spectacular blooms.