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Repotting guide

When & how to repot Air plant (Tillandsia)

Also called Tillandsia, sky plant.

About Air plant

Tillandsia · also called Tillandsia, sky plant · houseplant

Air plants are epiphytic bromeliads that grow without soil, absorbing moisture and nutrients through specialised leaf scales. They are sold by the dozen for terrariums and mounted displays, and most species are easy with weekly soaking. Pet-safe by ASPCA standards.

Tillandsia are epiphytic bromeliads from the Americas (e.g. Spanish moss, T. usneoides) that grow rootless on tree branches, telephone wires and rock, drawing all their water and nutrients from the air through specialised leaf scales.

Grown entirely without soil: mount on bark, driftwood, cork or in a hanging display, never potted in compost, and never glued in a way that crushes the water-absorbing trichomes (which do not regrow if damaged).

Mature size: 5-30 cm depending on species

Sources: rhs.org.uk, missouribotanicalgarden.org

How to tell air plant needs repotting

Repotting on a calendar is less reliable than reading the plant. For air plant, watch for these signs:

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot air plant

Every 2–3 years, into bone-dry mix. Air plant's growth habit — epiphytic rosette — sets the pace. Air plants are epiphytic bromeliads that grow without soil, absorbing moisture and nutrients through specialised leaf scales. They are sold by the dozen for terrariums and mounted displays, and most species are easy with weekly soaking. Pet-safe by ASPCA standards.

What size pot to step air plant up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Air plant stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot air plant

Spring or summer, while air plant is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Step-by-step: repotting air plant

  1. Repot dry. Do not water air plant for several days first. Working with dry roots and dry mix dramatically lowers the rot risk for a succulent.
  2. Pick a snug, fast-draining pot. Choose terracotta one size up at most, with a drainage hole. Have gritty none — grown without substrate ready.
  3. Tip it out and clean the roots. Slide the plant out, crumble off the old soil, and trim any black, mushy or dead roots with clean snips.
  4. Pot into dry mix. Set air plant at its original depth in dry gritty mix, firming gently. Do not bury the stem deeper than it was.
  5. Wait a week before watering. Leave it completely dry and out of harsh sun for about 7 days so any damaged roots callus. Only then water lightly.

Aftercare

Keep air plant completely dry and out of fierce sun for about a week so any nicked roots callus before they meet moisture; watering a freshly repotted succulent is the classic way to rot it. Then resume the normal lean, dry rhythm. Do not fertilise for about 3 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for air plant

Air plant wants none — grown without substrate. Display on driftwood, in glass globes, or wired to cork. Never glue to a surface; the glue blocks the leaf scales. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting air plant — frequently asked questions

How often should you repot air plant?

Every 2–3 years, into bone-dry mix for air plant. Repot air plant every 2–3 years into a snug pot of none — grown without substrate, ideally in spring or summer. Let it sit in dry soil and do not water for about a week afterwards so any nicked roots can callus. Over-potting and watering straight away is what rots succulents.

What size pot does air plant need?

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Air plant stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes. Use our pot size calculator to size it from the plant's current pot and root spread.

When is the best time of year to repot air plant?

Spring or summer, while air plant is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Should you water air plant after repotting?

No — not straight away. Repot air plant into dry mix and wait about a week before the first watering so any damaged roots callus over. Watering a freshly repotted succulent is the single most common way to rot one.

Should you fertilise air plant after repotting?

Not immediately. Wait about 3 weeks after repotting air plant. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.

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