Orchid care guide (Phalaenopsis)

Stop using ice cubes

Ice cube watering became popular because it seemed like an easy way to water slowly and prevent overwatering. It is also actively harmful to your orchid, and the advice should be ignored entirely.

Phalaenopsis orchids are native to tropical and subtropical forests across Southeast Asia and the Philippines. Their roots evolved in environments where temperatures rarely drop below 60F. Cold water from ice cubes chills the roots and can cause cold-water stress visible as dark, water-soaked patches on leaves or root damage that does not show up until the plant declines weeks later.

Water your orchid with room-temperature water. Run the pot under a lukewarm tap or let water sit out until it reaches room temperature. That is all the modification needed.

Bark, not soil

Phalaenopsis orchids are epiphytes. In the wild they do not grow in soil at all. They attach themselves to the bark of trees with their roots exposed to air, absorbing moisture from rain and humidity. The roots photosynthesize (they are often green for this reason) and need airflow around them to function.

Regular potting soil is completely wrong for orchids. It holds too much moisture, starves the roots of air, and leads to root rot within weeks or months. Orchids sold in clear plastic pots with holes along the sides are designed specifically to let air reach the roots.

Plant orchids in:

• Orchid bark mix: chunky fir bark, often sold pre-blended as "orchid potting mix"
• Bark and perlite blend: 60 to 70 percent bark, 30 to 40 percent perlite for improved drainage
• Sphagnum moss: works well for mounted orchids or those in smaller pots. Dries faster than bark and requires more frequent watering

Repot every 1 to 2 years or when the bark breaks down and becomes dense and slow-draining (it eventually composts). Spring, just after or between blooming, is the best time to repot.

Light requirements

Phalaenopsis orchids need bright indirect light. The leaf color is your best guide: healthy orchid leaves are a medium, bright green. Dark green leaves mean the plant is not getting enough light. Yellowish or olive-green leaves mean it is getting too much.

Orchids absolutely cannot tolerate direct midday sun. The leaves will sunburn within hours, developing white or brown bleached patches that are permanent.

Best window direction

An east-facing window is the classic recommendation for Phalaenopsis orchids, and for good reason. The morning sun is bright enough to support vigorous growth and regular reblooming, but gentle enough that there is no risk of leaf burn. Orchid growers with east windows consistently have the easiest time getting their plants to rebloom.

A west-facing window works well, particularly in spring and fall when afternoon sun is less intense. In summer, pull the orchid back a foot or two from a west window, or add a sheer curtain to filter the stronger afternoon rays.

A south-facing window with a sheer curtain is also acceptable. Unfiltered south windows in summer are too intense. In winter, a south window with lower sun angles can be excellent for orchids.

A north-facing window is generally too dim for regular blooming. Orchids will survive but may never produce another flower spike. If a north window is your only option, supplemental grow light significantly improves outcomes.

Watering

The most effective way to water a Phalaenopsis orchid is the drench and dry method:

1. Take the orchid to a sink
2. Run room-temperature water over the bark and roots for 30 to 60 seconds until the bark is thoroughly saturated
3. Let it drain completely for several minutes
4. Return it to its spot and do not water again until the roots are mostly gray and dry

In practice this works out to roughly once per week in summer and once every 10 to 14 days in winter. But use the roots as your guide, not the calendar.

Never let an orchid sit in standing water. The inner plastic pot should always drain freely, and any decorative outer pot should be emptied after watering. Water that pools in the crown (the center where leaves emerge) can cause crown rot, which is often fatal.

Understanding orchid roots

Orchid roots are unlike the roots of almost any other common houseplant, and understanding them prevents a lot of unnecessary worry and damage.

• Gray or silvery white roots: healthy and dry. This is the velamen (a spongy outer layer) when dry. The plant is ready to water
• Bright green roots: healthy and freshly watered. The velamen is saturated with water
• Wrinkled, shrunken roots: severely underwatered. The roots have lost their stored moisture. Water more frequently
• Brown, mushy roots: rot from overwatering or standing water. Cut away with sterile scissors back to healthy white tissue. Let dry before repotting into fresh bark
• Aerial roots growing outside the pot: completely normal. Do not cut them off or try to push them back into the pot. They are healthy and photosynthesizing

Many growers panic at the sight of aerial roots and try to tuck them back into the bark. This is unnecessary and often damages them. Leave them alone. They are doing exactly what orchid roots do in nature.

How to get it to rebloom

This is what most people struggle with: the orchid bloomed beautifully when they bought it, the flowers eventually dropped, and then... nothing. Months pass with no new spike. What went wrong?

Phalaenopsis orchids are triggered to produce new flower spikes by a temperature drop in autumn. They need nighttime temperatures of 55 to 65F for 4 to 6 weeks to initiate the reblooming process. Most homes are kept at a consistent temperature year-round, which removes this trigger.

How to provide the temperature differential:

• Move the orchid to a windowsill in September or October where nights get noticeably cooler. Many windowsills drop 10 to 15 degrees at night even in heated homes
• Move the orchid to an unheated room (garage, spare room) overnight for 4 to 6 weeks if your home is very consistently warm
• Reduce watering slightly during this cool period

After the cool period, bring the orchid back to its normal bright spot, resume regular watering, and wait. A new spike typically emerges from between the leaves within 8 to 12 weeks. The spike looks like a small green nub at first; do not mistake it for a root (roots grow straight down and are rounded at the tip; spikes have a flatter, slightly pointed tip that develops a visible node pattern as it grows).

What to do with the spike after blooming

After the last flower drops, you have two options for the flower spike (the stem that held the blooms):

Option 1: leave the green spike and wait. If the spike is still green and healthy, it may produce a keiki (a baby orchid clone) or branch from one of its nodes and produce more flowers. This is less reliable than the autumn method but sometimes works. Leave the spike for 2 to 3 months and see.

Option 2: cut it back. If the spike has turned yellow or brown, or if you want the plant to put its energy into leaves and roots rather than a spent spike, cut it back to about an inch above the base with sterile scissors. The plant will direct its energy into building a stronger root system and healthier leaves, which leads to a better flower spike in the next bloom cycle.

Either choice is valid. Cutting back tends to produce more reliable and vigorous reblooming. Leaving the spike occasionally produces a secondary flowering but more often just delays the next full bloom cycle.

Common problems

Crown rot

Brown, mushy tissue at the center of the plant where leaves emerge. Caused by water pooling in the crown. This is often fatal. Remove all affected tissue with a sterile blade, dust the cut with cinnamon (a natural fungicide), and keep the area dry. Prevent it by watering at the roots only, never pouring water into the center of the plant.

Yellow leaves

One or two yellow lower leaves is normal aging; the plant periodically sheds its oldest leaves. Several yellowing leaves at once usually indicates overwatering or root rot. Check the roots: if many are brown and mushy, remove them and repot in fresh bark.

Wrinkled, accordion-pleated leaves

Severe underwatering over a long period. The leaves have lost internal water pressure (turgor). Water thoroughly and the leaves may partially recover, though severe wrinkling may be permanent. Increase watering frequency going forward.

Leaf sunburn

White, tan, or bleached patches on leaves from direct sun exposure. The damage is permanent. Move the plant away from direct sun. The existing damaged leaves will remain scarred, but new growth will be healthy.

No new spike after months

The plant needs the autumn cool-down trigger or more light. Try placing it in a cooler spot for 4 to 6 weeks (nighttime temperatures of 55 to 65F) and moving it to a brighter window.

Scale insects

Brown bumps on the underside of leaves and along the pseudobulb. Treat by scraping off what you can and wiping with isopropyl alcohol. Neem oil spray applied weekly for 6 to 8 weeks eliminates most infestations.

Common orchid types

Frequently asked questions