Air plant care: soaking, light and drying

Light

Air plants want bright light, but the sources disagree on how much sun. Clemson asks for bright, filtered light from an east, south or west exposure and says not to place them in direct sunlight; UF/IFAS and the RHS agree, the RHS suggesting a south-facing window behind a net curtain. NC State takes a bolder view: most species tolerate full sun in nature, so the sunniest window is not too much, and flowering demands high light. The reconciling detail is heat. Behind glass or inside a closed globe, direct sun overheats the plant, and the RHS lists scorched, bleached leaves as the result.

So start in bright, filtered light, about 150 to 300 foot-candles on the Illinois Extension scale, and match the plant to its leaves. Clemson notes that hard, silver-gray species handle the brightest spots, while soft, green-leaved Tillandsia prefer less light and more moisture. NC State adds that LED grow lights can make up for a dim room.

Water

Watering advice varies more for air plants than for almost any other houseplant, so it helps to see the range. Clemson's air plant sheet says to water once a week, either by misting well or by submerging the plant for 20 to 30 minutes. Its bromeliad sheet suggests misting every two to three days, or a half-hour soak every week to 10 days. UF/IFAS describes a weekly misting heavy enough that water runs off. The RHS, writing for brighter conditions, immerses plants in rainwater two to three times a week from spring until autumn, while NC State asks for at least one thorough watering a week.

What every source agrees on is drying. After a soak, shake the plant gently and turn it upside down so water drains from the crown; Clemson calls this important to prevent rot, and the RHS says plants should even be mounted facing downward. Good air circulation lets the leaves dry within a few hours. The RHS also warns that Tillandsia will not tolerate being kept continuously wet. A soak followed by a full dry-off is the cycle; how often you repeat it depends on heat, light and dryness of the air.

Watch the leaves for feedback. Clemson and UF/IFAS both say curled or rolled leaves signal dehydration, along with dull color and brown tips. In winter, the RHS advises watering less often in cool, humid conditions and not at all if the room falls to 54°F, because the plant then stays wet too long. Use rainwater where tap water is hard.

Soil and pH

There is no soil to choose. Air plants are displayed on bark, cork, driftwood, shells or rocks, laid on dry pebbles in a shallow dish, or hung in glass globes. UF/IFAS suggests fixing them with wire or an adhesive, letting hot glue cool slightly first, and both Clemson and UF/IFAS insist that the mount must not hold water. Avoid moss packed around the base, which stays wet against the plant. Glass globes look good but trap moisture, so take the plant out to soak and let it dry fully before returning it.

Humidity

NC State notes that Tillandsia ionantha requires high humidity, with the leaf scales capturing some moisture from the air, and Clemson's bromeliad sheet suggests a kitchen or bathroom window, where steam from dishes and showers helps. The RHS adds the counterweight: air plants evolved in places with superior airflow, and a well-ventilated position is very important. Humid air with moving air around the plant is the target; stagnant humidity in a closed container leads to rot.

Temperature

The RHS gives the clearest figures: air plants do best when the temperature does not fall below 54°F (12°C), and they tolerate a maximum of about 86°F (30°C) if humidity is high. Normal room temperatures are ideal. They can spend summer outdoors in light shade, as NC State and the RHS both suggest, but bring them in before nights cool in early autumn. Keep them away from heaters, which dry them out within days.

Fertilizer

Feeding is optional. Clemson says fertilization is not necessary but makes plants more vigorous, and recommends a liquid bromeliad fertilizer once a month at one quarter of the recommended rate, added to the normal watering. NC State suggests half strength or less during the growing season, and the RHS sometimes soaks plants overnight in summer with orchid fertilizer added. Use the weaker dilution and feed only in spring and summer.

Work out the dose for your watering can with the fertilizer dilution calculator →

Repotting

There is nothing to repot, but plants do outgrow their displays. When pups form a clump too big for the mount or globe, move the clump to a larger support or divide it. The RHS advises waiting until pups reach about a third of the size of the mother plant before detaching them. Check the mount at the same time: Clemson warns that any material that holds water will rot the base.

• Pups have reached about a third the size of the parent
• The clump has outgrown its mount or globe
• The mount stays damp after watering

Propagation

Most Tillandsia are monocarpic: the RHS explains that each rosette grows to maturity, flowers, sets seed and dies, but produces offsets from its base first. Flowering is a sign of good care, often with leaves flushing red beforehand, and UF/IFAS notes indoor blooms appear in late winter or midsummer and last days to months. Detach pups once they reach about a third of the parent's size, or leave them to form a clump. Seed is possible but, as NC State puts it, a very slow process.

Methods: Pups (offsets) detached from the parent, Seed (very slow) · Best season: whenever pups reach about a third of the parent's size, usually spring or summer.

Common problems

Air plants fail in two opposite ways. Dehydration shows as curled, rolled, dull leaves with brown tips and is the common result of misting alone; an overnight soak can revive a dried plant, according to the RHS. Rot shows as a brown or black center, with leaves falling out of the base, and comes from water trapped in the crown without enough airflow. The RHS also lists bleaching from overheating in sun and gradual dehydration from long use of hard water. NC State names mealybug and scale as the usual pests.

Not sure which one it is? Try the plant problem diagnosis tool →

Is the air plant toxic to cats and dogs?

The ASPCA has no entry for Tillandsia or air plants on either its cats or its dogs list, and none of the extension sources we reviewed rates them as toxic or non-toxic. The ASPCA does list several other bromeliads as non-toxic, including Neoregelia, Guzmania and Cryptanthus, but that is not a rating for Tillandsia itself, so we mark its status as unconfirmed rather than safe. The practical risk is a cat batting a light air plant off a shelf and chewing it, which also destroys the plant. Display air plants out of reach, and call your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435 if a pet eats one and seems unwell.

Check any other plant against the ASPCA lists →