Gastrochilus retrocallus (syn. Haraella retrocalla)

Gastrochilus retrocallus (syn. Haraella retrocalla) is a miniature epiphytic orchid native to Taiwan, where it grows on mossy tree trunks and branches in humid forest environments at mid to high elevations. It forms a tiny monopodial plant with short stems and fleshy, distichous leaves, producing small, pendant inflorescences with a few sequentially opening flowers that are typically yellow to pale green with a contrasting lip and a noticeable citrus-like fragrance; its compact size and frequent blooming make it especially popular among collectors of miniature orchids.

Features:

• Growth type: Miniature monopodial epiphytic orchid with a very compact habit

• Size: Typically only a few centimeters tall, ideal for terrariums or mounts

• Leaves: Thick, fleshy, and arranged in two ranks along the stem

• Flowers: Small, fragrant blooms with yellow-green tones and a contrasting lip

• Inflorescence: Short, pendant spikes with a few sequentially opening flowers

• Habitat: Native to humid forests at elevations around 500–2200 m

Care Tips:

• Light: Bright, filtered light; avoid strong direct sun

• Watering: Water regularly but allow the medium to dry slightly between waterings

• Humidity: Prefers high humidity (around 70–85%) with good airflow

• Temperature: Cool to warm-intermediate conditions, avoiding extremes

• Mounting/Potting: Best grown mounted on bark/cork or in a very well-draining mix

• Fertilizer: Apply dilute fertilizer regularly during active growth

• Airflow: Ensure good ventilation to prevent rot and maintain healthy roots