How often should I water an orchid?

Most moth orchids (Phalaenopsis) in bark need water about once every 7 to 10 days, when the potting medium is nearly dry and the roots inside a clear pot look silvery rather than green. Orchids in sphagnum moss dry more slowly and need water less often.

Should I water orchids with ice cubes?

It's not the best method. Ice cubes give too little water to wet the whole root system, and moth orchids come from warm forests. Soaking the pot in room-temperature water for 10 to 15 minutes, then draining well, waters the roots evenly.

What do I do with an orchid after the flowers fall off?

If the flower spike is still green, you can cut it just above a node below the lowest flower to encourage a side branch, or leave it. If it turns brown, cut it at the base. Then keep caring for the plant normally while it grows new leaves and roots.

How do I get my orchid to bloom again?

Give bright indirect light and, in autumn, about four weeks of cooler nights around 13 to 16 °C (55 to 60 °F). That night-time drop is the main trigger for a new flower spike on moth orchids.

Are orchids safe for cats?

Yes. The ASPCA lists the moth orchid (Phalaenopsis) as non-toxic to cats and dogs.

Orchid Care Indoors: Watering, Light and Reblooming

Orchid care indoors is mostly about getting three things right: bright, indirect light, a chunky bark mix that lets roots breathe, and watering only when the medium is nearly dry. This guide focuses on moth orchids (Phalaenopsis), the orchid sold in most supermarkets and garden centres, because they're the easiest to keep and rebloom at home. With the right care they flower for two to three months, often once or twice a year, for many years.

Moth orchids are epiphytes. In the wild they grow on tree trunks in warm, humid forests of Southeast Asia, with roots clinging to bark and exposed to air. That's why they hate dense soil and soggy roots, and why their thick roots have a silvery coating (velamen) that soaks up water quickly after rain.

Orchid care at a glance

Need	What works	Avoid
Light	Bright, indirect; east window ideal	Hot midday sun; dark corners
Water	Soak when medium is nearly dry, about every 7–10 days	Watering on a schedule regardless of dryness
Potting medium	Orchid bark or bark mix; sphagnum for small plants	Regular potting compost
Pot	Clear plastic orchid pot with drainage	Pots without holes; oversized pots
Temperature	18–29 °C (65–85 °F) by day; cooler nights trigger blooms	Below 13 °C (55 °F); cold draughts
Humidity	40–70%	Very dry air next to radiators
Feeding	Weak orchid fertiliser regularly while growing	Full-strength feed every watering
Pets	Non-toxic (ASPCA)	—

Light

Moth orchids like the kind of light found under a forest canopy: bright, but filtered.

East-facing window: ideal. Gentle morning sun, then bright shade.
South or west window: good if set back a little or behind a sheer curtain.
North window: often too dim in winter for reblooming; place right at the glass.

Leaf colour is a reliable guide. Medium olive or grassy green is right. Dark green leaves mean too little light, and the plant may not flower. Yellowish or reddish leaves, or bleached patches, mean too much sun. If light is limited, a grow light 20 to 30 cm above the leaves for 12 hours a day works well; see grow lights for houseplants or measure your window with the plant light meter converter.

Watering

Overwatering kills more orchids than anything else. The aim is to drench the roots, then let them almost dry.

When to water

Roots in a clear pot: silvery-grey means dry, green means still wet.
Pot weight: a dry pot feels noticeably lighter.
Finger or skewer test: push into the bark; if it comes out dry, water.

In bark, that's usually every 7 to 10 days in summer and every 10 to 14 days in winter. Sphagnum moss holds more water, so it may be every two weeks.

How to water

Take the orchid to the sink.
Run room-temperature water through the pot for 15 to 30 seconds, or soak the pot in a bowl for 10 to 15 minutes.
Let it drain completely; never leave it standing in water.
Water in the morning so leaves and the crown dry by night.
Keep water out of the crown (where leaves meet). If it gets in, tip the plant or dab with a paper towel to prevent crown rot.

Ice cubes?

The ice cube method is popular because it prevents overwatering, but it delivers little water to a small part of the roots. Soaking is better. If ice cubes are the only way you'll remember, three cubes a week won't kill a healthy plant, but the roots will grow better with proper soaking. More general advice is in how to water houseplants.

Potting medium and pots

Medium	Pros	Cons	Best for
Medium orchid bark	Airy, drains fast	Dries quickly; breaks down in 1–2 years	Most moth orchids
Bark, perlite and charcoal mix	Balanced air and moisture	Needs mixing	Most growers
Sphagnum moss	Holds water	Easy to overwater; compacts	Small plants, dry homes
LECA / semi-hydro	Clean, no rot from decaying media	Needs a learning curve	Experienced growers

Clear plastic pots let you see the roots and give a little light to them. Decorative ceramic outer pots are fine as long as the inner pot drains and water doesn't collect at the bottom.

Temperature and humidity

Moth orchids like the same temperatures people do: about 18 to 29 °C (65 to 85 °F) by day and slightly cooler at night. Keep them away from cold draughts in winter and from radiators and heaters. A humidity of 40 to 70 percent is ideal; most homes manage around 40 to 50 percent. Grouping plants or using a humidity tray (a tray of pebbles and water, with the pot sitting above the water line) helps a little. Misting does little and can leave water in the crown.

Fertilising

Orchids are light feeders. Use an orchid fertiliser at a quarter to half the label strength every two weeks, or a very weak solution at every watering ("weakly, weekly"), while the plant is growing new leaves and roots. Flush the pot with plain water once a month to clear salt build-up. Reduce feeding in winter if growth slows. Work out the exact amount with the fertilizer dilution calculator.

Orchid care after blooming

When the last flower drops, look at the spike:

Spike condition	What to do
Green and firm	Cut about 2 cm above a node (a small bump) below the lowest flower to encourage a side spike, or leave it; it may rebloom from the tip
Turning yellow or brown	Cut at the base with clean scissors
Plant is weak (few leaves, poor roots)	Cut the spike at the base so energy goes into leaves and roots

Then carry on with normal care. The plant usually grows one or two new leaves and fresh roots before it flowers again.

How to get an orchid to rebloom

Light: move it to the brightest indirect light you have. Too little light is the main reason orchids don't rebloom.
Cool nights: in autumn, give about four weeks of night temperatures around 13 to 16 °C (55 to 60 °F), about 6 to 8 °C lower than daytime. A cool windowsill or unheated room works.
Steady feeding: keep feeding at low strength during growth.
Healthy roots and leaves: a plant with at least three or four good leaves and firm roots is ready.
Patience: a new spike usually appears as a mitten-shaped tip from between the lower leaves, then takes two to three months to open.

Repotting

Repot every one to two years, when the bark breaks down, roots overflow the pot, or after flowering.

Water the day before so roots are flexible.
Remove the plant and shake off old bark.
Cut off dead roots (brown, hollow or mushy) with sterile scissors. Keep firm green or silver roots.
Choose a pot only slightly larger, or the same size if roots were trimmed.
Hold the plant so the base of the lowest leaf sits just at the bark surface, and fill with fresh, pre-soaked bark, tapping to settle.
Wait about a week before watering normally, keeping the plant in shade, so cut roots can heal.

Aerial roots growing out of the pot are normal; don't cut healthy ones. For general technique see how to repot a houseplant.

Common orchid problems

Symptom	Likely cause	Fix
Wrinkled, limp leaves	Dehydration, often from rotted roots	Check roots; trim rot, repot, water properly
Mushy brown roots	Overwatering, old broken-down bark	Repot in fresh bark; water less often
Bud blast (buds fall before opening)	Draughts, sudden temperature change, ripening fruit nearby, dry air	Keep conditions steady; move away from fruit bowls and heaters
Yellow lower leaf	Natural ageing if one leaf at a time	Normal; remove once fully yellow
Several yellowing leaves	Overwatering or too much sun	Check roots and light
Black, watery spot in crown	Crown rot	Cut away affected tissue, keep dry, apply cinnamon; often fatal
Sticky residue, white fluff	Mealybugs or scale	See mealybugs on plants
No flowers for over a year	Low light, no cool night period	Brighter spot and autumn cool nights

For broader diagnosis see plant leaf problems and root rot treatment.

Other orchids you might see

Orchid	Light	Water	Difficulty
Moth orchid (Phalaenopsis)	Medium–bright indirect	Soak when nearly dry	Easy
Dendrobium (nobile and phalaenopsis types)	Bright	More in growth, less in winter	Moderate
Oncidium (dancing lady)	Bright indirect	Keep lightly moist	Moderate
Cattleya	Bright, some direct	Dry between waterings	Moderate
Paphiopedilum (slipper orchid)	Medium	Keep evenly moist	Moderate
Cymbidium	Very bright, cool	Moist in growth	Better outdoors in summer

Orchids and pets

Moth orchids are listed by the ASPCA as non-toxic to cats and dogs, making them a good flowering plant for pet homes. Check other plants with the plant toxicity checker or see pet-safe houseplants.

Quick orchid care checklist

Bright, indirect light; leaves medium green
Soak when roots are silvery, then drain fully
Chunky bark in a clear pot with drainage
Weak orchid feed while growing
Cool nights in autumn to trigger spikes
Repot every one to two years

Sources and further reading

American Orchid Society: Orchid care, for light, watering and repotting.
University of Florida IFAS Gardening Solutions: Orchids, for growing conditions.
ASPCA Toxic and Non-Toxic Plants list, for pet safety.