Plant care guide
Rubber Plant Brown Tips: Salts, Watering, Dry Air or Feeding?
Updated
Why does my Rubber plant have brown tips?
Brown tips on rubber plant leaves usually point to the root zone: salt build-up from fertilizer or water, or a mix that swings between bone dry and soggy. Hot, dry air and strong sun can also dry leaf tips. Browning along the edges of old leaves, with yellowing, can be a feeding problem rather than a watering one.
What to do first
Check the mix about 5 cm (2 in) down and look for white crust on the surface or pot rim. Flush the pot with at least twice its volume of water, then water only when the top has dried slightly. Pause feeding, and move the plant away from heaters and hot glass.
A rubber plant’s big, waxy leaves show every flaw, so a row of brown tips is hard to ignore. The browning will not reverse, but it usually has a simple cause in the pot or the room. Fix that, and the next leaves come in clean.
Clemson Extension’s houseplant disorders factsheet lists four causes of brown tips and margins: hot, dry air, improper watering, insect feeding and salt build-up. Start with the pot.
Sort the cause
| What you find | Likely cause |
|---|---|
| White or grey crust on the mix or pot rim; brown tips on older leaves; lower leaves dropping | Salt build-up |
| Mix bone dry deep in the pot, leaves wilting and grey-green | Underwatering |
| Mix wet, leaves yellowing or dropping | Overwatering, possible root rot |
| Plant beside a radiator or heat vent, tips dry and crisp | Hot, dry air |
| Dry, shrivelled leaves on the sunniest side | Too much sun or low humidity |
| Brown or yellow edges on the oldest leaves, plant not fed for a long time | Feeding problem |
| Large brown blotches or puckered young leaves after a cold spell | Cold injury, not tip burn |
Salts: the most common root-zone cause
University of Maryland Extension’s watering guide lists salt build-up symptoms as reduced growth, brown leaf tips, dropping of lower leaves, dead root tips and wilting. UMD’s salt deposits page explains that the salts compete for moisture and can burn tissue.
UF/IFAS Extension’s interiorscape Ficus guidelines (EP136) cover rubber plant. They pair tip burn on older leaves with sodium toxicity, and advise leaching the soil. They also link high soluble salts to loss of the oldest leaves and shrivelled roots. UF advises not feeding indoor figs at all for about four weeks after they arrive.
Watering swings
Clemson’s rubber plant factsheet advises watering thoroughly and letting the soil dry slightly to the touch between waterings. It warns that leaves may yellow if the soil stays too wet, and links root rot to poor drainage or watering too often. UMD notes that a dry plant wilts and turns grey-green, while a wet one drops leaves or turns yellow.
If the mix is wet and leaves are yellowing too, follow our rubber plant overwatering guide.
Dry air and sun
Clemson says rubber plants prefer humid conditions but tolerate the dry air of most homes. UF/IFAS links dry, shrivelled Ficus leaves to low humidity or too much sun. A plant pressed against a sunny window or above a heater is the usual suspect. Scorched patches in the middle of the leaf are covered in our rubber plant sunburn guide.
Feeding and cold
UF/IFAS lists necrosis or yellowing of old leaf margins as a sign of potassium deficiency. Clemson suggests a water-soluble houseplant fertilizer every two weeks in spring and summer, less in low light. Rule out salts before you add more feed.
Penn State Extension’s Ficus disease table describes cold injury on rubber plant as large brown blotches on mature leaves and puckered young leaves. That pattern is covered in our rubber plant brown spots guide.
What to do
- Check the mix about 5 cm (2 in) down, as UMD suggests.
- Leach salts. Pour at least twice the pot’s volume of water through the mix and let it drain completely, as UMD advises. Empty the saucer.
- Pause feeding until new leaves look clean, then follow the label rate.
- Water evenly. Let the top dry slightly, then water thoroughly.
- Move the plant away from heaters, vents and hot glass. Clemson gives 24–27 °C (75–80 °F) by day and 16–18 °C (60–65 °F) at night, never below 13 °C (55 °F).
- Inspect leaf undersides for mealybugs and spider mites, which Clemson names on rubber plant.
Judge the result on new leaves over the next month or two.
References
- Clemson Cooperative Extension HGIC 2251: Houseplant Diseases & Disorders
- Clemson Cooperative Extension HGIC: Rubber Plant
- University of Maryland Extension: Watering Indoor Plants
- University of Maryland Extension: Mineral and Fertilizer Salt Deposits on Indoor Plants
- UF/IFAS Extension: Cultural Guidelines for Commercial Production of Interiorscape Ficus (EP136)
- Penn State Extension: Ficus Diseases
How this guide was put together: Clemson Cooperative Extension, University of Maryland Extension, UF/IFAS Extension and Penn State Extension guidance.