Ascocentrum ampullaceum "Big Plant"

A compact, intensely flowering orchid with a distinctly tropical character. Ascocentrum ampullaceum is known for its dense clusters of bright orange, pink or purple flowers - depending on origin and clone. This species is rare in the trade, but loved by connoisseurs for its small size, powerful appearance and adaptability to greenhouse, windowsill or even hanging system.

Origin

Ascocentrum ampullaceum is native to the tropical mountain forests of India, Nepal, Bhutan and Southeast Asia, where it grows as an epiphyte on tree branches in warm, humid environments. Although the genus Ascocentrum is now formally merged with Vanda, this species is still often offered under the old name in the fancier world because of the obvious morphological differences.

Characteristics

The plant remains relatively small, with firm, upright leaves in a double fan shape. The roots are airy and gray-green, typical of epiphytic orchids. During flowering, a compact cluster develops with numerous small, round flowers that are remarkably long-lasting. The inflorescence usually appears at the tip of the plant and, in mature specimens, forms an exuberant feast of colors. Colors vary by clone from deep purple-pink to bright orange.

Care

Light

Lots of bright light to light morning sun. Tolerates more sun than the average orchid if properly acclimated. In dark months, apply supplemental light if necessary.

Temperature

Ideally between 20-28 °C during the day, with nights around 16-18 °C. Short cooldowns are tolerated, but avoid prolonged below 14 °C.

Substrate

Preferably grown without substrate in a hanging basket or on cork, possibly with a little sphagnum around the roots. Also possible in very coarse bark, provided air circulation is high.

Humidity

Between 60% and 85%. Dry air slows growth and negatively affects flowering. Suitable for greenhouse or well-ventilated terrarium.

Watering

Spray daily in warm temperatures. In cooler periods reduce to 3-4 times per week. Preferably use demineralized water to avoid calcium deposits on roots.

Nutrition

During active growth, feed weekly with a diluted orchid fertilizer (1/4 strength). During dormant period, feed less frequently.

Flowering

Blooms once or twice a year, often in spring or summer, depending on climate and light. Flowers are small but very numerous, and last a long time. A mature plant can form several flower stems per season.