Bulbophyllum Care Guide

Light

Bulbophyllum orchids prefer intermediate light, around 15,000 to 20,000 lux. This is generally less light than Cattleyas require, but more than Phalaenopsis. Brighter light, provided it does not damage the leaves, can encourage better and more frequent flowering.

Bulbophyllums can also be grown indoors, as long as they receive good light and are not kept in a dim position.

Temperature

Bulbophyllums are generally considered warm to intermediate-growing orchids. Most prefer warm temperatures between 21°C and 27°C, but many can tolerate a broader range of around 7°C to 35°C. They will not tolerate frost.

A night-time temperature drop of around 6°C to 8°C can help encourage flowering. Species from high-altitude areas of Papua New Guinea usually prefer cooler conditions and may not be suitable for very hot climates. As a general guide, the minimum temperature for tropical forms is around 10°C, while equatorial species prefer a minimum of around 15°C.

Humidity

Bulbophyllums prefer high humidity, usually around 70%, along with very good air circulation throughout the year. Good airflow is especially important because these orchids are watered frequently, and stagnant conditions can increase the risk of fungal disease on the leaves.

Potting and Growing Media

Bulbophyllums can be grown mounted on cork or tree fern slabs, but most species also grow well in shallow pots or baskets. The key requirement is to keep enough moisture around the roots, as most Bulbophyllums do not like to dry out completely.

Because many species have creeping rhizomes, the plant can be trained to remain in the pot by gently bending the rhizome. Older bulbs may eventually be cut and left in place to support additional growth in the pot.

Sphagnum moss is commonly used because it holds moisture well, which Bulbophyllums appreciate during active growth. However, once sphagnum begins to break down or hold too many salts, it can cause problems for the plant. A mix of small bark and perlite is also suitable.

Repot as infrequently as possible, as Bulbophyllums do not like unnecessary disturbance. Repotting is best done in spring or autumn when new growth appears, usually around every three years.

Watering

Bulbophyllums need plenty of water while they are actively growing. Even a short dry period of a couple of days can damage new growths and set the plant back.

Because they have shallow, fine root systems, they need constant moisture around their roots. However, depending on the species and its natural habitat, some Bulbophyllums may need a more distinct wet and dry period to flower well. The potting mix should never be allowed to dry out completely, although plants can usually be kept slightly drier during winter.

Fertiliser

Use a balanced liquid fertiliser at weak strength, applied from once a month to weekly depending on growth and watering frequency. Bulbophyllums also respond well to fish emulsion and other organic fertilisers.

For an organic feeding option, try our Organic Fertiliser.