Keep your home between 65 F (18 C) and 80 F (27 C). At that range, most tropical orchids grow well without a greenhouse. These plants make up most of what sells at grocery stores and garden centers.
The orchid family itself reaches far beyond the tropics, though. Cold hardy species grow as far north as Canada and the Alps.
Are Orchids Tropical Plants?
Most cultivated orchids are tropical or subtropical. The orchid family grows on every continent except Antarctica. Some species tolerate real winter cold.
Almost none of those cold tolerant species get sold as houseplants, though.
The orchids on nursery shelves trace back to warm regions. Phalaenopsis, Cattleya, and Vanda are the three most common examples. They come from tropical Asia, the tropical Americas, and parts of Africa.
That history is why “orchid” and “tropical orchid plant” get used almost interchangeably by beginners.
The family itself runs roughly 25,000 to 30,000 species. Growers have also bred over 100,000 registered hybrids on top of that base. Only a small slice of that total shows up at retail.
Most of what sells is tropical, and it sells because it is easy to grow indoors.
Most tropical orchid species also share one trait. They grow as epiphytes, anchored to tree bark instead of soil. Epiphytic orchids pull water and nutrients from rain and humid air.
Leaf litter that collects in the bark adds some nutrition too.
How Warm Do Tropical Orchids Need to Be?
Tropical does not mean one fixed temperature. Extension guidance sorts tropical orchids into three groups. Growers call them warm, intermediate, and cool, based on the elevation where each species evolved.
Warm growers want days of 72 to 80 F. Nights should sit near 60 to 65 F for this group. Phalaenopsis and Vanda both fall into the warm category.
Intermediate growers prefer cooler days, around 68 to 70 F. Nights should drop to about 60 F for these plants. Cattleya and Oncidium are typical intermediate growers.
Cool growers come from higher elevations, often cloud forest habitat. They want days of 65 to 70 F and nights of 50 to 55 F. Cymbidium is the best known cool growing genus.
A day to night drop of 10 to 20 F helps most orchids stay healthy. That same drop can help trigger blooming in many species. Humidity matters as well, with 40 to 60 percent covering general care needs.
For a full breakdown by genus, see orchid temperature guidelines and humidity targets for orchids.
| Group | Night temperature | Example genera | Indoor fit |
|---|---|---|---|
| Warm | 60 to 65 F night, 72 to 80 F day | Phalaenopsis, Vanda | Matches most heated homes |
| Intermediate | 60 F night, 68 to 70 F day | Cattleya, Oncidium | Good near a cool window |
| Cool | 50 to 55 F night, 65 to 70 F day | Cymbidium, Odontoglossum | Needs an unheated room |
A Common Mistake With Tropical Orchid Care
Many care guides treat tropical as a synonym for hot and steady. That advice skips the day to night drop that many species actually need. Constant heat with no night dip can stop an otherwise healthy plant from ever spiking.
A Phalaenopsis held at 75 F around the clock may grow lush leaves and still refuse to bloom. Extension guidance and grower experience both point to the same fix. A real night drop, even a modest one, matters more than raw warmth alone.
Classic Tropical Orchid Genera by Region
Different tropical orchids evolved in different parts of the world. Those origins still shape how each genus is grown today.
Phalaenopsis and Vanda both come from tropical Asia, but they split into very different habits. Phalaenopsis grows low in the forest canopy, shaded by taller trees. That is why it tolerates the lower light found in most homes.
Vanda grows high up, in the open canopy, under strong direct sun.
American Orchid Society guidance puts Vanda light needs at 50 to 100 percent full sun. That works out to around 5,000 footcandles or more. Few windowsills can match that, which is why Vanda often struggles indoors.
Cattleya is the classic tropical orchid plant of the Americas. It grows natively from Mexico through Brazil. It wants only 20 to 35 percent full sun, with at least 4 hours of direct sun daily.
Nights should stay near 55 to 65 F, with days of 70 to 85 F.
Angraecum represents tropical Africa and Madagascar. Many species in this genus carry a long nectar spur. They release a strong fragrance at night to attract moth pollinators.
Oncidium spreads across a huge range in the tropical Americas, from Mexico down into South America. That wide native range means care needs vary a lot by species. A tag or seller description that names the parent species helps far more than the word Oncidium alone.
Two country pages go deeper: orchids of Malaysia for the Asian side and orchids of Brazil for the Americas.
Tropical Orchid Species That Are Not Rainforest Plants
Not every tropical orchid grows in a wet rainforest. Plenty of tropical orchid species evolved in seasonally dry forests. Those habitats have a real wet season and a real dry season each year.
Deciduous Dendrobium types fit this pattern well. Growers often call them nobile type or hard cane orchids. They drop their leaves once the dry season starts.
They rest on bare canes for a while, then flower before new growth begins.
Catasetum follows a similar rhythm. It grows fast through the wet months, putting out new leaves and pseudobulbs. Then it loses its leaves and goes dormant once conditions dry out.
Watering a dormant Catasetum on a normal schedule can rot the roots.
Which Tropical Orchids Suit a Home
Warm and intermediate tropical orchids fit an average home the best. Their preferred ranges line up closely with normal room temperature. That means no extra heating or cooling equipment is needed.
Phalaenopsis is the easiest tropical orchid plant for a windowsill. It wants nights of 60 to 65 F, and most living rooms already sit in that range.
Cattleya and Oncidium also do well indoors. Both just need a bright window with several hours of direct or strong indirect light.
Cool growing genera like Cymbidium are harder to keep indoors. Few homes stay anywhere near 50 F at night, even in winter.
A closed sunroom or an unheated spare room can sometimes make cool growers work. Barring that, a cool grower does better outdoors during a mild fall or spring. To compare care needs across the whole family, see this guide to orchid types.
Growing a Tropical Orchid Look Outdoors
Gardeners in USDA zones 10 and 11 can grow tropical orchids outside year round. They can mount plants on trees or pot them under filtered shade. Frost is the real limit here, not cold weather in general.
South Florida, coastal Southern California, and Hawaii cover most of that zone in the United States. A shaded tree trunk or a slatted wood basket both work well for mounting in those climates.
Outside those warm zones, these plants can still summer outdoors for part of the year. Extension guidance for the Northeast says frost danger usually passes by late May, and warmer regions can move plants out earlier. It also recommends misting plants once outdoor temperatures climb above 90 F.
Gardeners in colder regions who still want an orchid look have other options. True cold hardy orchids exist for garden beds in much cooler zones. They follow very different rules than any tropical orchid plant does.
See how cold orchids can tolerate for those limits. For the full native range of the family, see where orchids grow naturally.
Sources
- American Orchid Society: Vanda Culture Sheet. https://www.aos.org/orchid-care/care-sheets/vanda-culture-sheet
- American Orchid Society: Cattleya Culture Sheet. https://www.aos.org/orchid-care/care-sheets/cattleya-culture-sheet
- Royal Botanic Gardens, Kew: How to look after your orchids. https://www.kew.org/read-and-watch/orchid-care-expert-tips
Frequently asked questions
Are all orchids tropical?
No. Most orchids sold in stores are tropical or subtropical, but the family also includes cold hardy species that grow well outside the tropics.
What temperature do tropical orchids need?
Warm growers like Phalaenopsis want nights of 60 to 65 F. Intermediate growers like Cattleya prefer nights around 60 F. Cool growers like Cymbidium need nights of 50 to 55 F.
Can tropical orchids grow outside?
Yes, in USDA zones 10 and 11 they can grow outdoors year round. In cooler zones they can only summer outside once frost danger passes.
Which tropical orchid is easiest for beginners?
Phalaenopsis is usually the easiest choice. Its warm growing needs match normal room temperature in most homes.
Do tropical orchids need high humidity?
General guidance points to 40 to 60 percent humidity for most tropical orchids. A pebble tray or humidity tray can help in dry, heated homes.