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Maidenhair fern brown leaf tips and edges: causes and what to do

6 results in the diagnosis tree begin with brown tips and edges, 3 of them marked likely when the answers fit. They are ordered here for Maidenhair fern (Adiantum raddianum), using what its sources say about humidity, soil moisture, cold tolerance, watering and feeding and one problem recorded for it.

Sources last read 14 September 2026.

Start the diagnosis for this Maidenhair fern

Maidenhair fern (Adiantum raddianum), the whole plant.
Krzysztof Ziarnek, Kenraiz, CC BY-SA 4.0 · Wikimedia Commons

Adiantum raddianum, the Delta maidenhair fern, is one of the most popular ferns to grow indoors. It is native to South America and its common name comes from its shiny, dark leafstalks that resemble human hair. Wikipedia, CC BY-SA 4.0

Native range: Mexico to Trop. America (wet tropical). Also sold as Delta Maidenhair, Pacific Maidenhair and roseate maidenhair fern.

What Maidenhair fern’s sources say that bears on this

Humidity
ASHRAE recommends indoor relative humidity between 30% and 60%
Penn State Extension · read 11 September 2026
Soil moisture
Moist but well-drained
RHS · read 11 September 2026
Cold tolerance
H1C — 5–10°C
RHS · read 11 September 2026
Watering
The genus name derives from the Greek adiantos, "unwetted", referring to the leaves that shed water.
NC State Extension · read 13 September 2026
Between mid spring and late summer, water generously and feed monthly with a general liquid feed at half strength. Give little water in winter.
RHS · read 13 September 2026
Feeding
Between mid spring and late summer, water generously and give a general liquid feed at half strength each month.
RHS · read 13 September 2026

How this shows up on a Maidenhair fern

Brown tips on the newest fronds first

Fronds on the side of the maidenhair fern nearest a heater or vent brown at the edges while those on the far side stay clean.

Dry air takes water from the leaf surface continuously, and the tissue at the edge is last in the queue for what the roots send up. Penn State Extension notes there is no single humidity figure that suits every indoor plant.

Telling it apart: Whether the damage advances. Dry air marks a leaf and stops; rot keeps going.

Penn State Extension · read 11 September 2026

Possible causes, likeliest first for a Maidenhair fern

  1. Most likely too little water

    Ranked higher because Maidenhair fern's recorded problems point this way.

    • Moist but well-drained RHS · read 11 September 2026

    Why: Soil dry two inches down leaves the roots nothing to send up, and the leaf edges are the last tissue in line.

    What to try:

    • Water thoroughly, until it runs from the drainage hole.Useful: pot with drainage holes
    • Check the soil with a finger every few days rather than watering on a fixed day.Useful: moisture meter

    What would settle it: Water it thoroughly and watch the next new leaves. If they come in with clean edges under steadier watering, the edges were thirst.

    Check this with the questions

  2. Most likely a build-up of salts in the soil

    • Loam; pH Alkaline or Neutral RHS · read 11 September 2026

    Why: Minerals from tap water and fertiliser are left behind as water evaporates, and a white crust on the compost or the pot rim is where they show.

    What to try:

    • Water slowly and heavily until several times the pot's volume has run through the drainage hole, to wash the salts out.Useful: pot with drainage holes
    • Scrape off the top layer of crusted compost and replace it.

    What would settle it: Scrape the crust. If it is gritty and dissolves in water it is mineral; if it is fluffy it is mould, which is a different problem.

    Check this with the questions

  3. Most likely cold

    • H1C — 5–10°C RHS · read 11 September 2026

    Why: Soft, dark patches rather than crisp ones are damaged tissue rather than dried tissue.

    What to try:

    • Move it away from the glass at night, or keep the curtain on the room side of the maidenhair fern.
    • Leave damaged leaves until new growth appears, then remove the worst of them.

    What would settle it: Where the maidenhair fern sits at night, and what the glass feels like at that hour. Damage that appeared after one cold night, on the side facing the window, is the pattern.

    Check this with the questions

Less likely for a Maidenhair fern, still possible

Questions

What usually causes brown tips and edges on a Maidenhair fern?
For Maidenhair fern: most likely too little water, most likely a build-up of salts in the soil and most likely cold.
How can I tell which one it is on my Maidenhair fern?
Is the browning crisp and dry, or soft and dark? Crisp and dry; Soft and dark.
What do Maidenhair fern's sources say about its soil moisture?
RHS: Moist but well-drained.
What does this look like on a Maidenhair fern?
Fronds on the side of the maidenhair fern nearest a heater or vent brown at the edges while those on the far side stay clean. Telling it apart: Whether the damage advances. Dry air marks a leaf and stops; rot keeps going.

Something else wrong with the Maidenhair fern?

Everything the sources say about Maidenhair fern

What this does not cover

This page orders a decision tree's results using a plant's sourced care. It has not seen your plant, its pot or its window, and two problems at once are common: that is the usual reason a confident answer turns out wrong. The questions in the diagnosis tool narrow it further than a list can.