How to Grow Oncidium 'Mascara'

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Oncidium 'Mascara'

Oncidium × 'Mascara'

flower

Oncidium 'Mascara' is a hybrid orchid prized for its striking burgundy and cream flowers with prominent dark markings resembling mascara. This compact orchid produces abundant, long-lasting blooms on arching sprays ideal for indoor cultivation. It is a moderate-care orchid suited to intermediate conditions.

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Example Oncidium 'Mascara' timeline · Pittsburgh, PA (Zone 6b)

Plant Oncidium 'Mascara'
Around Apr 17

Near Pittsburgh's average last spring frost.
Tend & protect
Late spring–summer

Watering, feeding, and pest-watch reminders.
First Oncidium 'Mascara' blooms
Mid-to-late summer

Before the first fall frost (≈ Nov 8)

Sample dates for Pittsburgh, PA. Sign up to get exact Oncidium 'Mascara' dates for your own zip code.

Growing Conditions

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Sun: Bright, indirect light; 3,000-5,000 lux; east or west-facing window preferred; avoid intense afternoon sun

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Water: Water thoroughly when bark is nearly dry; typically weekly in growing season; reduce frequency in winter dormancy. Use room-temperature, preferably soft or distilled water. Never allow roots to sit in water.

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Spacing: Not applicable for container orchids; pot size 4-6 inches typical inches

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Days to maturity: Blooms develop 3-6 months after emergence; mature plants rebloom annually

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Planting depth: Crown level in orchid bark mix; do not bury base of plant

Soil

Type: Orchid bark mix (medium to fine grade), often with sphagnum moss and perlite

pH: Not applicable (soilless medium)

Amendments:

Orchid bark (primary component) Sphagnum moss (for moisture retention) Perlite or coconut chips (for aeration) Charcoal (optional, for drainage and clarity)

Growth Stages

Dormancy

4-6 weeks

Plant rests with minimal new growth; pseudobulbs are mature and firm with one or two leaves

Reduce watering slightly; maintain cool temps (55-65°F) to encourage blooming; water every 10-14 days; fertilize less frequently

Bud Initiation

3-4 weeks

New spikes emerge from base of pseudobulbs; tiny flower buds visible on spike

Maintain cool nights (10°F difference from daytime); bright light essential for spike development; gradually resume normal watering

Flowering

6-12 weeks

Multiple burgundy and cream flowers with dark mascara-like markings open along the spike; blooms are fragrant and long-lasting

Provide bright, indirect light; maintain 55-70°F; water when bark nearly dry; ensure good air circulation; avoid moving plant during bloom

Post-Bloom Growth

4-6 months

After flowers drop, plant enters active growth phase with new pseudobulbs, leaves, and roots emerging

Resume full watering and fertilizing schedule; provide bright light; maintain warmth (65-75°F); fertilize with balanced orchid fertilizer weekly at quarter strength

Companion Planting

Plan your garden →

Plant with:

Other Oncidium hybrids Phalaenopsis orchids Cattleya orchids Paphiopedilum orchids Tropical houseplants (as display companions in same environment)

Avoid planting near:

Ethylene-producing plants (ripening fruit, withering flowers) in same display Plants requiring significantly different humidity or watering Direct draft sources

Common Pests

Increase humidity; spray leaves with water; apply neem oil or miticide if severe
Remove with cotton swab dipped in rubbing alcohol; apply insecticidal soap or neem oil
Remove manually with soft brush; apply horticultural oil or insecticidal soap; repeat treatment
Increase humidity and air circulation; use sticky traps; apply neem oil or spinosad
Repot in fresh bark mix; remove affected roots; reduce watering frequency; ensure excellent drainage

Uses

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Edible garnish

Culinary

Oncidium flowers are non-toxic and can be used as elegant edible garnishes for desserts and cocktails in fine dining. [source]

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Cut flower arrangement

Household

The long, arching sprays of colorful flowers are ideal for cut floral arrangements, lasting 1-3 weeks in water and adding tropical elegance to interior spaces. [source]

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Corsage and boutonniere

Craft

Individual Oncidium blooms or small sprays are popular for corsages, boutonnieres, and wedding arrangements due to their striking appearance and longevity. [source]

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Indoor pollinator attraction

Wildlife

While primarily an indoor plant, blooming Oncidium orchids attract orchid bees and other pollinators if grown in open-air tropical environments, supporting insect populations. [source]

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Indoor ornamental houseplant

Household

Oncidium 'Mascara' is cultivated primarily as a decorative houseplant, adding tropical aesthetic and color to patios, windowsills, and living spaces year-round. [source]

Harvest Tips

Cut flower spikes when the first flower opens or bud is showing color; place in clean vase with fresh water; change water every 2-3 days. Blooms last 1-3 weeks in a vase. Leave one or two nodes on the spike to encourage secondary branching.

Fun Facts

🌱 The name 'Mascara' refers to the dark, prominent markings on the lower petals and lip (labellum) that resemble applied mascara eyeshadow.
🌱 Oncidium orchids are sometimes called 'dancing lady' orchids because the lip (labellum) resembles a woman in a ball gown, and the flower's structure makes them appear to 'dance' when moved by air currents.
🌱 Oncidium hybrids like 'Mascara' were extensively bred beginning in the Victorian era, and thousands of registered hybrids now exist, making them among the most popular orchids for home growers.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Hybrid pH

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