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Low humidity damage

Also known as Dry air damage, Brown leaf tips

DiseaseHarmful

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In short

Many tropical houseplants come from humid habitats, and very dry indoor air can make their leaves lose water faster than it is replaced. The result is crisp brown leaf tips and edges and early dropping of leaves, buds and flowers. A humidifier, grouping plants or an enclosed case helps; misting does very little.

How it looks

Leaf tips and edges turn brown and crisp, often on otherwise healthy, well-watered plants; leaves may be thin, shrivelled or curled. Buds and flowers may drop before opening. Thin-leaved plants show it first. The potting mix is moist and the plant is not wilting, which separates it from underwatering.

Signs

Brown, crispy leaf tips and margins; shrivelled new leaves that fail to open cleanly; bud and flower drop; symptoms worst in heated rooms or near heaters and vents.

What favours it

Indoor relative humidity below about 30%, which Penn State Extension notes is common in heated homes in winter (recommended indoor range 30–60%); positions near heaters, vents or draughts; thin-leaved tropical plants. Cacti and succulents tolerate dry air.

Prevention

  • Measure humidity with a hygrometer rather than guessing.
  • Use a humidifier near humidity-loving plants; it is the most practical and measurable fix.
  • Group plants together to create a slightly more humid microclimate.
  • Grow the most demanding plants in a terrarium, glass case or cloche.
  • Keep plants away from heaters, air vents and draughts.

Treatment

Start with the first step and move down only if the problem persists.

  1. Raise humidity with a humidifier, grouping or an enclosure, and move plants away from dry air sources.
  2. Check that the plant is not also underwatered or suffering salt build-up, which cause the same symptom.
  3. Browned tips will not turn green again; they can be trimmed off with clean scissors for appearance.

Pros and cons

Cons

  • Damaged tips do not turn green again.
  • Misting and pebble trays are widely recommended but raise humidity only briefly or negligibly.

Look-alikes

Underwatering
Underwatered plants wilt and the mix is dry.
Salt and fertilizer burn
Salt burn often comes with a white crust on the mix or pot and a history of heavy feeding.
Spider mites
Spider mite damage can also look dry and faded; look for fine pale speckling and webbing on leaf undersides.

Affected plants

Humidity-loving tropical houseplants, especially thin-leaved ones, during the heating season; cacti and succulents tolerate dry air.

Sources

  1. Humidity and Houseplants — Penn State Extension
  2. How to help a poorly houseplant — RHS
  3. Houseplant Problems — UC Statewide IPM Program

Written in our own words from these sources. Check a product label before using any treatment.