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Oncidium Yuan Nan Gold is a beautiful and fragrant hybrid orchid, known for its yellow and brown flowers and long spikes. It's a cross between Oncidium Sharry Baby and Oncidium sphacelatum.
Here's a comprehensive guide for Oncidium orchids care:
1. Light:
Ideal: Bright, indirect light is best. An east or west-facing window is usually suitable.
Signs of proper light: Leaves should be a light yellow-green. Dark green leaves might indicate insufficient light, while reddish-tinted leaves could mean too much light.
Avoid: Direct, harsh sunlight, especially during the hottest parts of the day, as it can scorch the leaves.
2. Temperature:
Daytime: 21−29∘C (70−85∘F)
Nighttime: 13−16∘C (55−60∘F)
Oncidium Yuan Nan Gold prefers intermediate to warm growing conditions.
3. Humidity:
Oncidiums, including Yuan Nan Gold, prefer a humidity level of 40-80%, with some sources suggesting 60-80% for this particular hybrid.
To increase humidity:
Use a humidity tray (a saucer with pebbles and water, ensuring the pot doesn't sit in the water).
Use a room humidifier.
Mist the leaves occasionally, especially in dry environments.
4. Watering:
Frequency: Water thoroughly every 7-10 days during active growth (spring to fall). Reduce watering to every 10-14 days in winter.
Method: Allow water to drain completely from the pot to prevent soggy roots, which can lead to root rot. Never let the pot sit in standing water.
How to check: The potting medium should be half dry before rewatering. You can also insert a wooden popsicle stick or chopstick into the pot; if it comes out dry, it's time to water. Oncidiums are thirsty orchids, and a common issue is under-watering, which can make them look "sad."
5. Potting and Medium:
Medium: Use a well-draining orchid mix. Common mixes include bark, perlite, and sphagnum moss. Coconut husk chips are also a good option as they retain moisture while allowing good aeration.
Repotting: Repot every 2-3 years, or when the potting medium starts to break down. The best time to repot is in spring when new growth appears.
Pot size: Small, deep pots are often preferred to accommodate their root systems.
6. Fertilizing:
Frequency: Fertilize every two weeks during active growth.
Type: Use a balanced orchid fertilizer (e.g., 20-20-20 or 19-19-19 NPK) diluted to half or quarter strength.
During blooming: Some sources suggest a bloom-booster formulation (e.g., 10-30-20) as flower spikes are forming.
Important: Never fertilize a completely dry plant, as this can damage the roots. Flush the potting mix with plain water once a month to prevent salt buildup.
7. Air Circulation:
Good air circulation is crucial to prevent fungal issues, especially with higher humidity. A small fan can be beneficial in enclosed spaces.
8. Blooming and Dormancy:
Oncidium Yuan Nan Gold can bloom multiple times a year, typically in spring and fall.
After blooming, cut the flower spike off at the base. Allow the plant to rest with slightly reduced watering and feeding.
Tips for Success:
Root health: Healthy roots are firm and white or green.
Fragrance: Oncidium Yuan Nan Gold is known for its pleasant fragrance, inherited from Oncidium Sharry Baby.
Observation: Pay attention to your plant's leaves and pseudobulbs. Wrinkled pseudobulbs often indicate a need for more water.
By following these guidelines, you can enjoy the beautiful and fragrant blooms of your Oncidium Yuan Nan Gold orchid!
