Renanthera citrina

Renanthera citrina is a small epiphytic (occasionally lithophytic) orchid species native to Vietnam and nearby regions. It grows on mossy tree trunks or rocky limestone bluffs in humid forests at mid-elevations (about 650–1200 m).

Features:

• Plant Size: Small-sized orchid with a short woody stem and pendulous growth habit.

• Leaves: Narrow to lanceolate, rigid, leathery, curved, unequally bilobed at the tip.

• Inflorescences: Long spikes (up to ~45 cm) carrying up to ~25 small flowers.

• Flowers: Bright lemon-yellow star-shaped blooms with purple-violet spotting and no fragrance.

• Bloom Season: Typically winter into spring.

Care Tips:

• Light

• Provide very bright light — similar to Vanda-type orchids.

• Bright filtered light with some morning or late afternoon direct sun is ideal.

• Temperature

• Prefers intermediate to warm conditions (approx. 23–28 °C / 73–82 °F day).

• Slight drop at night can be beneficial; avoid prolonged cold.

• Watering

• Keep the plant evenly moist during active growth, but never sitting in water.

• Allow roots to dry slightly between waterings, especially if mounted.

• Humidity

• High humidity (60–85%) is important — misting or a humidity tray helps.

• Ensure humidity is balanced with good air circulation.

• Air Circulation

• Strong airflow prevents rot and mimics its natural breezy habitat.

• Growing Medium / Mounting

• Best grown mounted on cork/wood or in hanging baskets with very airy medium.

• If potted, use a fast-draining, coarse mix so roots never stay wet.

• Fertilizing

• During growth seasons, fertilize lightly and regularly with diluted orchid fertilizer.

• Reduce feeding in cooler periods.

• Rest Period / Dormancy

• In winter, growth slows; reduce watering and let roots dry more between waterings.