🌿 Generalities
The Phalaenopsis, or "Moth Orchid", is the most common and beloved orchid: easy to cultivate, it blooms for a long time and adapts perfectly to indoor living. A mature plant produces 2-3 new leaves each year and can bloom for most of the year, with inflorescences laden with large, colorful flowers — from pure whites to spotted harlequins. 🌸
Cultivation requires light on the windowsill and constant humidity. Each year, once growth is complete (usually in autumn), a flower spike emerges from beneath the second or third leaf from the top. In consistently warm homes, it may be necessary to expose the plant to lower temperatures (~15°C) for a few nights to stimulate flowering. Phalaenopsis bloom from late winter to spring. The same care applies to Doritis and Doritaenopsis.
☀️ Light
Phalaenopsis love indirect light: in nature, they grow under tree canopies, with intense but filtered light. An east-facing window is ideal; south or west-facing windows are also suitable with sheer curtains. 💡
The color of the leaves is your indicator:
- Olive green = perfect ✅
- Dark green = too little light
- Reddish hues = too much light
Once blooming has started, you can move the plant anywhere in the house away from direct sunlight. With artificial light: 4 fluorescent tubes 15-30 cm from the leaves, for 12-16 hours a day.
🌡️ Temperature
Phalaenopsis are ideal for household temperatures: minimum 16°C at night, 21-27°C during the day (recommended max 28-32°C with higher humidity and air circulation). To stimulate flowering in autumn, night temperatures down to 12°C for a few weeks are beneficial. Avoid sudden temperature changes, drafts, air conditioners, and direct radiators. 🌡️
💧 Water
Phalaenopsis do not have pseudobulbs: they should never dry out completely. Always water early in the morning to allow evaporation before sunset. 🚰
- In bark: approximately every 7 days
- In sphagnum moss: when the top part is dry
- Outdoors: every 2-4 days
Use rainwater, distilled, or reverse osmosis water. Never use softened water. Water only the roots — avoid wetting leaves, flowers, and the crown (risk of rot). Do not mist: it does not effectively increase humidity and can cause mold spots on leaves and petals. After watering, let it drain thoroughly before putting the plant back on display. If in doubt, wait a day.
⚠️ We strongly advise against the ice cube technique: in colder climates it increases cold stress; in warm climates it does not provide enough water.
💨 Humidity
Ideal humidity is between 50% and 80%. The best method: a tray with gravel and water under the pot (roots should not touch the water). 🪴
Plump, wrinkle-free leaves indicate a well-hydrated plant. In greenhouses or humid environments, always ensure good air circulation: leaves should dry by sunset. Never leave roots submerged in water.
🌸 Flowering and reblooming
Phalaenopsis is among the longest-blooming orchids: flowers last 2-6 months. A mature plant can bloom 2-3 times a year. After flowering, the stem turns brown: cut it near the base. 🌟
To stimulate reblooming:
- Place the plant in a bright window (South or East) with abundant indirect light
- Ensure a day/night temperature fluctuation: 21-29°C during the day, 16-21°C at night
- Increase local humidity with humidity trays
- Fertilize every 2 weeks at a reduced concentration during the vegetative phase
Stem cutting: You can cut above a node for faster (but smaller) lateral reblooming, or cut at the base for more abundant future flowering. Some Phalaenopsis with Violacea, Amboinensis, Cornu-Cervi parentage produce sequential blooms on the same stem for years: only cut them if the plant becomes too untidy.
⚗️ Fertilization
Always use fertilizer at a reduced concentration but with greater frequency. Fertilizer is essential during the vegetative phase; it is not necessary during flowering.
- For growth: 20-20-20 (NPK) — 2 g/L, every 14 days
- For flowering (vegetative phase only): 0-52-34 (MPK) — 1 g/L, every 14 days
🪵 Substrate, repotting, and propagation
Repot every 1-3 years: when the substrate deteriorates or the roots become too large for the pot. Prefer transparent pots: roots contribute to photosynthesis and benefit from light. Choose pots with many drainage and ventilation holes. Do not use pots larger than necessary. ♻️
Suitable substrates: bark, perlite, expanded clay, sphagnum moss, peat, or mixes. During repotting, assess the roots and remove any brown, mushy, or damaged ones with clean shears. The plant thrives better with a few healthy roots than with many diseased ones.
Brown and mushy roots should be removed; white or beige and firm roots should be kept.
Phalaenopsis are monopodial and do not divide. They naturally reproduce via keikis — plantlets identical to the mother plant that appear on flower spikes. The keiki is ready to be detached and repotted when it has 2-3 leaves and its own roots of about 8 cm (after about a year). 🌱
A keiki ready to be detached from the mother plant.
🐛 Pests and common problems
Fungal and bacterial diseases are frequent due to the necessary humidity. The most common problems: root rot, leaf spots, wilting, and spots on flowers. Good ventilation and well-draining substrate are the best prevention. 🚫
