Phalaenopsis tetraspis var. alba

Phalaenopsis tetraspis var. alba is a selection of the species Phalaenopsis tetraspis, endemic to Sumatra, the Andaman Islands, and the Nicobar Islands, where it grows in warm, humid forests from sea level to approximately 100 m. In recent taxonomy, Phalaenopsis speciosa is often treated as a synonym; both names remain in use commercially. The plant is medium-sized, with leaves up to 30 cm long and 2–5 lateral flower spikes that are arching and often slightly zigzag in appearance. The flowers are waxy, glossy, and strongly scented, usually around 40 mm across, with natural variation in color and pattern.

Flowering is more frequent in spring, but it may also occur during other warm seasons.

The white form retains the species’ size and flowering pattern: multiple lateral spikes with fleshy, waxy, strongly scented flowers.

It requires moderate to bright, filtered light, approximately 18,000–22,000 lux, with protection from strong sunlight and, ideally, around 12 hours of light per day. Suitable temperatures are around 22–28°C during the day and 18–22°C at night; a 3–4°C difference between day and night helps promote flowering. It does not require a severe rest period.

Water when the substrate dries out, then allow the water to drain completely. Do not allow water to remain trapped between the leaves. In a pot, humidity of 55–60% is usually sufficient; when mounted, aim for around ~70%. During active growth, fertilize with a diluted solution (approximately half the recommended dose) after watering, about every third watering, using orchid fertilizer. Use a medium-grade, well-aerated bark mix. A Phalaenopsis substrate is suitable if it dries out at the pace of your home. Repot after flowering, when new roots appear.

If the plant produces many spikes but few flowers, check the light and fertilization. Bud drop often indicates dry air, a sudden change in location, or damaged roots. Soft roots and a sour smell indicate overwatering.