Crape myrtle 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 Crape myrtle (Lagerstroemia indica), using what its sources say about humidity, soil moisture and cold tolerance and 2 problems recorded for it.
Sources last read 14 September 2026.
Lagerstroemia indica, known as the crape myrtle, is a species of flowering plant in the genus Lagerstroemia of the family Lythraceae. It is native to East Asia, South Asia and Southeast Asia. Wikipedia, CC BY-SA 4.0
Native range: Himalaya to S. China and Indo-China (subtropical). Also sold as Common Crape Myrtle, Crape Flower, crapemyrtle, crepe flower, Crepe Myrtle and Indian crape myrtle.
What Crape myrtle’s sources say that bears on this
- Humidity
- ASHRAE recommends indoor relative humidity between 30% and 60%Penn State Extension · read 13 September 2026
- Soil moisture
- Well-drainedRHS · read 13 September 2026
- Cold tolerance
- H3 — -5 to 1°CRHS · read 13 September 2026
How this shows up on a Crape myrtle
Crisp margins that appear in winter
The crape myrtle shows browning on many leaves at once, all at the margin, with no spots or soft patches anywhere.
The edges fail first because they are the end of the plumbing. Penn State Extension cites 30% to 60% as the recommended indoor range, and winter heating regularly takes a room under it. That applies while it is grown indoors; its RHS rating of H3 describes a plant that also grows outside, where the air is seldom that dry.
Telling it apart: Whether it crumbles or smears. Crisp is water lost; soft and dark is cold or rot.
Penn State Extension · read 13 September 2026Dry, bruised edges after a cold, windy spell
After a windy spell the crape myrtle shows dry brown edges and torn leaves on its exposed side. New growth that follows is undamaged if the weather settles.
RHS describes it as needing shelter. Moving air dries leaf surfaces quickly and bruises soft tissue, so a canopy in a windy spot is marked on the side the wind reaches.
Telling it apart: Timing. Damage that appeared after one windy day is weather; damage that builds slowly is water or roots.
RHS · read 13 September 2026Possible causes, likeliest first for a Crape myrtle
Most likely too little water
Ranked higher because Crape myrtle's recorded problems point this way.
Its source describes well-drained soil for this plant, so soil that dries between waterings is expected. The concern is soil left dry long enough for the plant to go limp or wrinkle.
- Well-drained RHS · read 13 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.
Most likely cold
Ranked higher because Crape myrtle's recorded problems point this way.
Its RHS hardiness rating puts this plant's cold floor at or below freezing, so cold damage in a heated room is unlikely. A frost outdoors, or a night in a cold car, is another matter.
- H3 — -5 to 1°C RHS · read 13 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 crape myrtle.
- Leave damaged leaves until new growth appears, then remove the worst of them.
What would settle it: Where the crape myrtle 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.
Most likely a build-up of salts in the soil
- Chalk, Loam, Sand; pH Acid or Alkaline or Neutral RHS · read 13 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.
Less likely for a Crape myrtle, still possible
Questions
- What usually causes brown tips and edges on a Crape myrtle?
- For Crape myrtle: most likely too little water, most likely cold and most likely a build-up of salts in the soil. Its source describes well-drained soil for this plant, so soil that dries between waterings is expected. The concern is soil left dry long enough for the plant to go limp or wrinkle.
- How can I tell which one it is on my Crape myrtle?
- Is the browning crisp and dry, or soft and dark? Crisp and dry; Soft and dark.
- What do Crape myrtle's sources say about its soil moisture?
- RHS: Well-drained.
- What does this look like on a Crape myrtle?
- The crape myrtle shows browning on many leaves at once, all at the margin, with no spots or soft patches anywhere. Telling it apart: Whether it crumbles or smears. Crisp is water lost; soft and dark is cold or rot.
Other plants that show brown tips and edges
Something else wrong with the Crape myrtle?
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.