Moth orchid

Dendrobium

Sympodial growth from visible cane-like pseudobulbs; flowers emerge along the cane rather than from a single central spike. Different care — Dendrobium needs a cool dry winter rest.

Cattleya / corsage orchid

Thicker leaves from visible egg-shaped pseudobulbs, much larger and more ruffled flowers (10–15 cm), usually fragrant. Requires much brighter light than Phalaenopsis.

Dancing lady orchid

Sprays of many small flowers (2–5 cm) with a prominent 'skirt' lip. Pseudobulbs and multiple thin leaves; requires drier and brighter conditions than Phalaenopsis.

Boat orchid

Grass-like narrow leaves in tall clumps; long arching spikes of waxy flowers. Needs a cool winter rest to flower — not a Phalaenopsis replacement in a warm heated room.

Bright indirect light — east window ideal, never direct midday sun.

Phalaenopsis grow in the dim under-canopy of Southeast Asian rainforests where the light reaching them is bright but diffused. Indoors, an east window is near-perfect; south/west windows need a sheer curtain. A useful quick test: hold your hand 20 cm above the leaves and look at the shadow — a fuzzy-edged shadow is ideal, a sharp shadow means too much light. Leaves should be a medium olive green; dark emerald leaves indicate insufficient light (the plant won't rebloom), and yellowish leaves indicate too much light.

Seasonal: Nordic winters above ~55°N: a full-spectrum LED at 10,000 lux for 12 hours/day from October to March maintains flowering cycles that would otherwise stall.

Soak weekly with filtered water; never let bark stay continuously wet.

The classic Phalaenopsis killer is too-frequent watering. Run the pot under a tepid-to-lukewarm tap for 30 seconds until water streams from the drainage holes, then let it drain completely before returning to any saucer. Water roughly weekly in summer and every 10–14 days in winter; adjust by checking the roots — plump emerald-green roots = wet, silvery-grey roots = dry and ready for water. Ignore the supermarket label advising '3 ice cubes per week': ice shocks tropical roots, and the volume is insufficient. Use filtered or rainwater if possible; Phalaenopsis is moderately fluoride-sensitive.

Seasonal: Reduce to every 10–14 days from November to February.

Coarse fir bark medium — NEVER regular potting soil.

Phalaenopsis roots are designed to cling to bark in airy conditions; planted in soil, they rot within weeks. Use coarse medium-grade fir bark (8–15 mm chunks), optionally mixed with sphagnum moss, charcoal, or perlite. Repot in fresh bark every 1.5–2 years — as bark breaks down, it holds more water and less air, and old plants decline rapidly in spent medium. Many orchid growers use clear plastic slotted orchid pots so they can watch root colour to judge watering.

50–70 % preferred; tolerates 40 %.

Moderate humidity supports root health and spike development. Below 40 %, flower buds may 'blast' (shrivel and drop before opening). A nearby humidifier is far more effective than misting, which promotes crown rot if it settles in the centre of the plant. Pebble trays under the pot help marginally.

18–27 °C day; 15–18 °C night drop triggers spikes.

The single most reliable trigger for a new flower spike is a sustained 5–7 °C drop between day and night temperatures for 2–4 weeks in autumn. Many homes in Nordic countries provide this automatically as heating cycles down overnight. Below 13 °C causes chilling damage (yellowing, leaf drop); above 30 °C slows growth and blocks spike initiation.

'Weakly, weekly' with dilute orchid fertiliser.

A balanced orchid fertiliser (e.g. 20-20-20 or a dedicated 'MSU' formula) at quarter the label rate with every other watering in spring and summer. Switch to a bloom-boosting formula (10-30-20) in late summer to early autumn when spike initiation is likely. Flush the bark with plain water once a month to prevent salt build-up — bark holds salts and they damage roots invisibly until browning shows.

Seasonal: Reduce to once a month from November to February.

After bloom, cut above a node on an old spike OR cut the spike off.

Once all flowers on a spike have dropped, you have two choices. (1) Cut the spike cleanly 1 cm above the second or third node from the base — a dormant bud often wakes up and produces a branch spike in 2–3 months. (2) Cut the spike off at the base — the plant redirects energy to roots and leaves and produces a stronger fresh spike in 4–6 months. Option 1 is faster; option 2 produces better flowers. Never cut a green spike still bearing flower buds.

Every 1.5–2 years — when bark breaks down, not when roots fill the pot.

Phalaenopsis enjoy being tightly fit in their pots. Repot because the bark has broken down into mush, not because the roots are crowded. Best time is just after flowering finishes, when the plant switches to active growth. Use the same pot size or only 2 cm larger; wider pots hold too much water. Tease out dead brown roots, trim with sterile scissors, and repot into fresh moistened bark. Stake any long spikes gently to avoid root breakage.

No documented toxicity. Phalaenopsis flowers are used as edible garnishes in some Southeast Asian cuisines, though commercial pesticides on ornamental plants mean home plants should not be eaten.

Listed by ASPCA as non-toxic to cats. Ingestion of flowers or leaves may cause mild GI upset in sensitive animals but no systemic effects are recorded.

Listed by ASPCA as non-toxic to dogs. Mild GI upset possible with any non-food plant ingestion but no systemic effects are recorded.