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How to Grow Cymbidium Orchid 'King Arthur'

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Cymbidium Orchid 'King Arthur'

Cymbidium × 'King Arthur'

flower

King Arthur is a classic Cymbidium hybrid orchid cultivar known for its stunning deep burgundy to wine-red flowers with contrasting lighter centers. This variety produces long, arching inflorescences with multiple blooms that can last 6-8 weeks or longer. It is a vigorous, reliable bloomer that rewards patient cultivation with spectacular winter to spring flowering.

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Example Cymbidium Orchid 'King Arthur' timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Cymbidium Orchid 'King Arthur'

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. First Cymbidium Orchid 'King Arthur' blooms

    Mid-to-late summer

    Before the first fall frost (≈ Nov 8)

Sample dates for Pittsburgh, PA. Sign up to get exact Cymbidium Orchid 'King Arthur' dates for your own zip code.

Growing Conditions

☀️
Sun: Bright indirect light; 2,000-3,000 foot-candles; 6-8 hours of quality light daily (outdoor morning sun or bright greenhouse/windowsill position; filter afternoon sun in hot climates)
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Water: Water thoroughly when top inch of bark mix is dry. During growing season (spring-summer), water every 5-7 days. Reduce frequency in fall-winter dormancy period (every 7-10 days). Use room-temperature distilled or rainwater. Good drainage is essential; never allow standing water. Mist foliage in dry environments.
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Spacing: 18-24 (minimum space between plants for air circulation) inches
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Days to maturity: Not applicable for blooming orchids; typically takes 3-5 years from young division to mature flowering plant; established plants re-bloom annually
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Planting depth: Plant with base of pseudobulbs at or just above soil surface; do not bury pseudobulbs

Soil

Type: Orchid bark mix (medium to coarse bark chips, perlite, charcoal, sphagnum moss)
pH: 5.5-6.5
Amendments:
Orchid bark (50-60%) Perlite or pumice (20-25%) Charcoal (10-15%) Sphagnum moss (10-15%) Slow-release orchid fertilizer incorporated into mix

Growing Zones

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Outdoors in zones 9b-11; elsewhere as indoor houseplant year-round or with seasonal outdoor placement

9b 10a 10b 11a 11b

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Growth Stages

1

New Growth/Vegetative

4-5 months (spring-early summer)

Fresh green shoots and new leaves emerge from pseudobulbs. Plant develops new roots and foliage in warm months.

Provide bright light, consistent warmth (70-85°F day, 60-70°F night), regular water, and balanced liquid fertilizer (20-20-20) every 1-2 weeks. Increase humidity to 50-60%.

2

Pseudobulb Maturation

2-3 months (midsummer)

New pseudobulbs develop and mature. Foliage darkens and thickens. Plant reaches full size for the season.

Continue warm, bright conditions. Fertilize regularly. Allow soil to dry slightly between waterings as plant prepares for dormancy trigger.

3

Dormancy/Flower Initiation

6-8 weeks (fall)

Plant growth slows. Cool, dry conditions trigger flower spike development at base of pseudobulbs.

Critical stage: reduce temperature to 55-65°F at night for 4-6 weeks (autumn). Reduce watering and fertilizer. This cool period is essential for spike initiation. Ensure 8-12 hour nights.

4

Spike Development & Budding

4-6 weeks (late fall-early winter)

Flower spikes elongate and develop buds. Spikes are initially green, then buds swell and show color.

Gradually return to warmer conditions (65-75°F). Resume regular watering once buds are visible. Support developing spikes with stakes and ties. Increase humidity to 50-60%.

5

Flowering

6-8+ weeks (January-April)

Deep burgundy to wine-red flowers with pale yellow/white centers open sequentially on arching stems. Up to 15-20 flowers per spike possible.

Maintain 60-70°F nights to extend bloom longevity (cooler = longer lasting). Continue normal watering. Avoid moving plant or exposing to drafts. Light fertilizer (diluted orchid fertilizer) every 2-3 weeks supports bloom duration.

Companion Planting

Plan your garden →

Plant with:

Other Cymbidium orchids (different colors, staggered blooming) Phalaenopsis orchids Paphiopedilum orchids Pothos or Areca palm (in greenhouse/growing space) Begonias (for humid micro-climate)

Avoid planting near:

Ethylene-producing plants (ripening fruit, vegetables) Strong-smelling plants (can mask orchid fragrance) Aggressive growers that compete for moisture Plants requiring heavy fertilization (nutrient competition)

Common Pests

  • Increase humidity to 60%+. Mist foliage regularly. Spray with neem oil or insecticidal soap every 5-7 days if infestation occurs. Isolate affected plant.

  • Remove with cotton swab dipped in 70% isopropyl alcohol. Spray neem oil or horticultural oil. Repeat every 7 days for 3-4 weeks. Inspect pseudobulbs and leaf axils carefully.

  • Remove by hand with alcohol-soaked swab. Apply horticultural oil spray. Repeat treatments every 7-10 days; can require extended management.

  • Spray with insecticidal soap or neem oil. Increase air circulation. Remove infested growth. Control usually effective within 1-2 weeks.

  • Prevent via excellent drainage and air circulation. Do not overwater. If rot develops, remove plant from pot, trim black/mushy roots, repot in fresh bark mix. Reduce watering frequency.

Uses

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Edible Orchid Garnish

Culinary

Cymbidium flowers are non-toxic and sometimes used as premium edible garnishes for fine dining and specialty beverages. The flowers are purely decorative and add elegant visual appeal without flavor contribution. [source]

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Long-lasting Cut Flowers

Household

King Arthur's burgundy blooms are highly prized for floral arrangements and last 2-3 weeks in water, making them ideal for wedding bouquets, special events, and home décor. [source]

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Wedding and Event Floristry

Craft

Professional florists favor Cymbidium orchids, especially elegant deep colors like King Arthur, for bridal bouquets, corsages, and high-end arrangements due to their longevity and sophisticated appearance. [source]

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Indoor Houseplant & Living Décor

Household

King Arthur serves as a stunning living houseplant that provides winter-to-spring color and interest indoors, adding tropical elegance to interior spaces with minimal ongoing care once established. [source]

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Pollinator Fascination

Wildlife

Cymbidium orchids attract bees and other pollinators in outdoor/greenhouse settings; the flowers' structure and visual display appeal to insects, supporting local pollinator populations in cultivation environments. [source]

Harvest Tips

Cymbidium orchids are not harvested but rather enjoyed as potted plants or cut flowers. For cut flowers: cut spikes when 2-3 flowers are open and remaining buds show color (use sharp, sterilized scissors). Place in clean water with floral preservative; flowers will last 2-3 weeks in a vase. Blooms open sequentially from base to tip, providing extended display.

Fun Facts

  • 🌱 Cymbidium orchids, including King Arthur, have been cultivated in China for over 2,000 years and are considered symbols of virtue and refinement in traditional Chinese culture.
  • 🌱 The cool dormancy period required to trigger flowering in Cymbidiums mimics their natural habitat in cool mountain regions of Asia; without this temperature drop, the plant may not bloom despite being healthy.
  • 🌱 King Arthur is a complex hybrid likely involving multiple Cymbidium species in its parentage; the 'King Arthur' name reflects the regal deep burgundy coloring that resembles royal regalia, and this cultivar has been a standard in orchid collections since the mid-20th century.

Gardening Terms

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

Cultivar Hybrid
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