Few things alarm plant owners more than a melastome shedding leaves. The good news is that leaf drop is a symptom with a limited list of causes, and you can usually find the culprit by working through them systematically.
Is it normal?
Some leaf loss is natural. Older leaves near the base of the plant may yellow and fall as new growth emerges, especially after flowering or in winter. If only a few old leaves are going and the plant is putting out new shoots, relax. Widespread or sudden loss is a different matter.
Step-by-step diagnosis
1. Check the roots and mix
Feel the potting mix. Is it soaking wet, or bone dry?
- Wet and leaves yellowing: likely overwatering or poor drainage. Slide the plant out of its pot. Healthy roots are pale and firm. Rotten roots are brown, soft and may smell. Trim damaged roots, repot into fresh, free-draining mix and water less. See watering and humidity for melastomes.
- Dry and leaves wilting: underwatering. Water thoroughly, and consider whether the pot dries out too fast or the plant is root-bound (repotting a melastome).
2. Look for a recent change
Melastomes can be sensitive to sudden changes. Ask yourself whether the plant has recently:
- Been moved to a new location or shipped.
- Experienced a cold draught, an open window or air conditioning.
- Been placed near a heater.
- Had a change in light.
Leaf drop a week or two after such a change is a common stress response. Keep conditions stable and the plant usually recovers.
3. Check temperature
Tropical melastomes suffer when temperatures drop below their comfort range. Cold nights can cause rapid leaf loss, especially in species like Medinilla magnifica. See winter care for tender melastomes.
4. Check humidity
Very dry air causes brown edges and drop, particularly in winter. Raise humidity if it is below what the species needs.
5. Check light
Too little light weakens the plant, and it sheds lower leaves. Too much sun scorches and then drops leaves. See light requirements for melastomes.
6. Inspect for pests
Turn leaves over and look for webbing, sticky residue, cottony tufts or tiny insects. Spider mites, mealybugs and scale can all cause yellowing and drop. See common pests on melastome houseplants.
7. Consider nutrition and salts
Heavy fertilising can burn roots, and hard water can build up salts. Flush the pot with plain water and cut back on feed. See soil and fertilizer for melastomes.
Quick reference
| Symptom | First thing to check |
|---|---|
| Sudden mass drop after moving | Stress from change, drafts, light |
| Yellow leaves, wet mix | Overwatering, root rot |
| Crispy brown edges | Dry air, salts, underwatering |
| Leaf drop in cold weather | Temperature |
| Sticky leaves or webbing | Pests |
Recovery
- Fix the cause. Do not change several things at once.
- Remove fully dead leaves and stems.
- Keep conditions stable.
- Be patient. New growth may take weeks to appear.
- Avoid fertilising a stressed plant until it recovers.
When a plant cannot be saved
If the stem is mushy and the roots are gone, take cuttings from any healthy shoots and propagate them. Stem cuttings of many melastomes root well (propagating Tibouchina from cuttings).
Takeaways
- Some leaf loss is normal. Widespread loss is not.
- Check roots and mix first, then conditions.
- Keep the environment stable during recovery.
- Cuttings can rescue a plant that is failing.