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Oncidiums are often called dancing lady orchids for the skirt-like shape of their flowers, which appear in sprays that can hold many small blooms. To grow one successfully, first find out whether it is a warm-growing or cool-growing type: their light and temperature needs differ, and a single routine will not suit them all.
What makes an Oncidium a “dancing lady” orchid?
Oncidium is a diverse genus of evergreen perennial orchids native to tropical and subtropical America. North Carolina State Extension reports 334 accepted species on its profile page; taxonomic counts can change, so that figure should be understood as the count reported there, not a permanent total. Many Oncidiums are epiphytes: they grow on trees for support, not as parasites.
The common name comes from the flowers’ resemblance to a dancer wearing a colorful skirt. Many warm-growing types produce branching sprays covered in small blooms. The Royal Horticultural Society (RHS) describes the effect as a “cloud of exotic butterflies.” Flowers may be yellow, pink, reddish-purple or white, sometimes with flecks or stripes. Depending on the plant, sprays can also need room to spread.
At the base of an Oncidium are swollen pseudobulbs, which store water and nutrients. New growth emerges from the plant’s base, and flowers develop on mature growth. Older pseudobulbs still help support the plant after flowering, so do not remove them just because their flowers have faded.
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#1 Best Overall
- Super easy to grow indoors, or outdoors in non-freezing zones. Just avoid temps below 50 F, and it will do well! chocolate fragrance in bloom! ‘Nuff said!
- Fast grower, easy to bloom, excellent for orchid beginners (and everyone else!). Lots of flowers with 10 – 20 buds per flower spike on more mature plants.
- How to grow--light: bright, shady conditions. Avoid direct sun. Water: 2X/week. Media: New Zealand Sphagnum Moss is excellent, although bark works well, too. Fertilizer: balanced fertilizer every two weeks. Temperature: 50 deg F – 95 deg F; keep well watered and misted when very hot. Avoid freezing!
- Please look carefully at photos to get an idea of size! There’s a pen or coin in each pic as a size reference. Photo is representative of plant you will receive.
Identify the growing group before choosing a spot
Oncidium care depends on the plant’s growing group. Some orchids formerly classified as Odontoglossum are now included in Oncidium, but that change in classification does not make their growing requirements interchangeable with those of warm-growing types. Check the plant label, cultivar name or supplier’s care information before setting a temperature target.
| Growing group | Temperature and light | Home suitability |
|---|---|---|
| Warm-growing Oncidiums | Bright indoor light; shade from intense summer sun. The RHS recommends a warm, bright spot. American Orchid Society (AOS) group-level guidance gives typical nights of 55–60°F (13–16°C) and days of 80–85°F (27–29°C), while noting that ordinary room temperatures can still work. | Often more adaptable to typical indoor conditions than cool-growing types, though light and temperature still affect growth and flowering. |
| Cool-growing Oncidiums, including some former Odontoglossum types | Bright, filtered light and a cool room or cool conservatory/greenhouse. The RHS specifies a minimum night temperature of 11°C (52°F) in its guidance. | Many can struggle in centrally heated homes. The RHS identifies Cambria hybrids as among the more suitable choices for home growers. |
These are care recommendations for groups, not guarantees for every hybrid or cultivar. If the plant is unidentified, the Orchid Society of Great Britain suggests initially treating it as a cool grower and observing its response; heat stress can develop more quickly and irreversibly than mild cool stress.
Set light and temperature to suit the plant
Warm-growing types
Give warm-growing Oncidiums a bright indoor position. East- or west-facing windows can work; protect the plant from harsh summer sun, especially while it is flowering. AOS notes that temperatures as high as 95–100°F (35–38°C) may be tolerated when nights cool to 70–80°F (21–27°C) and watering increases. That is a conditional tolerance range, not an ideal target temperature.
Rank #2
- Easy to grow orchid! Produces chocolate-scented blooms when it flowers (about once per year).
- Grows, fast, easy to bloom, great for orchid beginners (and everyone else!). Mature plants produce lots of flowers, with 10 – 20 buds per flower spike.
- Growing: Bright shady conditions work best. Avoid direct sunlight. Water about twice per week. These grow well in sphagnum moss or bark. Fertilize every two weeks. Avoid temps below 50 F.
- Please note that we offer these in different sizes. Photos show the different sizes offered, ranging from seedling size to Blooming Size. Please look carefully at photos to get an idea of the sizes we’re offering.
- Important: Plants are NOT in bud or bloom when shipped.
Cool-growing types
Place cool-growing plants in bright but filtered light. The RHS suggests a north- or northeast-facing window, or a cool conservatory or greenhouse. Avoid assuming that warmth intended for a warm-growing orchid will suit a cool type.
Too little light can also interfere with flowering. If a warm-growing Oncidium produces vigorous leaves but no flowers, insufficient light is one possible cause; check the plant’s exposure before changing several care conditions at once.
Water by checking the medium, not the calendar
Watering frequency varies with the plant, its roots and leaves, the potting medium, humidity, light and temperature. AOS notes that plants with larger, fleshy roots or leaves generally need less frequent watering than those with thin roots or leaves. Its general guidance is to water thoroughly and let the medium dry at least halfway through the pot before watering again. For indoor plants in its culture sheet, AOS advises keeping the medium lightly moist rather than allowing prolonged dryness.
Rank #3
- You will get 4 Oncidium Orchids (please see sample picture for a size referenceIf your weather is going to be below 37 and you are not able to receive them at your door, please purchase the heat pack variant of this product OR contact your local post office after shipping with your tracking number and ask them to hold your order for pickup. The orchids do not tolerate freezing temperatures for a long time and we will not be liable for any orchids , however some can be slightly smaller or larger)
- They will be shipped bare root (when you receive them, the roots will be dry, this is normal. Orchids are supposed to be completely dry before re-watering. Please soak them for a few minutes in lukewarm water and plant them in a good orchid medium.)
- Currently these orchids are not in spike or flower, these are small plants. You will love them.
- If your weather is going to be below 37 and you are not able to receive them at your door, please purchase the heat pack variant of this product OR contact your local post office after shipping with your tracking number and ask them to hold your order for pickup. The orchids do not tolerate freezing temperatures for a long time and we will not be liable for any orchids that die to inclement weather.
- Please read the description for more information.
The RHS warns that excessively damp compost can rot roots and pseudobulbs, and advises allowing some drying between waterings for warm-growing types. In practice, check how quickly the medium dries and adjust to the plant and room rather than following a fixed weekly schedule. Avoid both extended drought and persistently soggy compost, and do not leave standing water around the plant.
Balance humidity with airflow
Published humidity guidance varies by source and growing group. AOS gives 30–60% as suitable guidance for many Oncidiums. The RHS recommends 55–75% for warm-growing Oncidiums and 60–70% for cool-growing types. Treat these as source-specific ranges rather than one universal target: your plant’s group and growing conditions matter. Where humidity is high or the potting medium stays wet, maintain good airflow.
Feed lightly during active growth
Use a light, seasonal feeding approach while the plant is actively growing, and follow one regimen rather than combining different schedules. For warm-growing Oncidiums, the RHS recommends orchid fertilizer at quarter strength every second or third watering from spring to autumn. AOS also recommends regular feeding during active growth, with formulations depending on the growing medium. Follow fertilizer directions carefully; excess salts can contribute to brown or burned leaf tips.
Rank #4
- You will receive 5 orchid plants (see sample picture for size reference; some may be slightly smaller or larger).
- Delivered bare root with roots that will be dry on arrival, reflecting standard orchid handling prior to placement in suitable media.
- These orchids are not currently in spike or flower but are easy to grow, fast-growing, hardy, and forgiving.
- These orchids are easy to grow, fast-growing, hardy, and forgiving. Great way to start or improve your collection..
- Please read the description for more information.
Pot in an airy medium and repot when needed
Oncidiums need a breathable growing medium that drains freely while retaining moisture appropriate to the plant and its conditions. AOS lists fine orchid bark blended with sphagnum and/or tree-fern fiber as indoor options. The RHS recommends free-draining bark-based orchid compost. Fine-grade bark mix is a reasonable starting point, but choose texture and moisture retention to match the growing group, pot and how quickly the plant dries in your home.
Repot when the medium has deteriorated or there is no room for new growth, rather than disturbing the roots on an inflexible annual schedule. The RHS advises using a pot only slightly larger than the previous one and avoiding unnecessary root disturbance. AOS recommends repotting around the start of new growth, usually in spring, so roots can establish quickly. When potting, position the newest growth away from the pot edge to leave room for expansion.
Understand flowering, then troubleshoot symptoms
When to expect flowers
Warm-growing Oncidiums usually flower in autumn to winter, according to the RHS; a night-time temperature drop of about 5°C (10°F) may help stimulate flowering. Cool-growing types commonly bloom in late autumn, winter or spring, though they may flower at other times. In either group, flowering is associated with mature new growth, so a young or immature shoot may not bloom yet.
What common symptoms can suggest
- Wrinkled pseudobulbs: This can indicate too little water or roots that are no longer functioning. Check both watering and root condition rather than assuming the plant simply needs more water.
- Rotting roots or pseudobulbs: Excessively wet medium or standing water can contribute. Review drainage and how long the pot stays wet.
- Strong leaf growth without flowers: Insufficient light is one possible cause for warm-growing Oncidiums. Confirm the group and light level before making changes.
- Burned leaf tips: Fertilizer salts or hard water can be responsible. Consider water quality and feeding strength.
These are clues, not definitive diagnoses; more than one condition can cause similar symptoms.
Divide only an established, crowded clump
Division is appropriate when a clump is overcrowded. The RHS recommends dividing in spring just after flowering, with each division retaining at least three healthy pseudobulbs and a growing shoot. Keeping those pseudobulbs preserves stored resources that help support the plant.
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