If edges remain green, the most likely cause is DRY AIR.
Another possible reason is BRUISING - People or pets touching the tips can be the culprit, so can leaf tips pressing against a wall or window.
If edges are yellow or brown, the possible causes are many and varied (OVER WATERING, UNDER WATERING, TOO LITTLE LIGHT, TOO MUCH SUN, TOO LITTLE HEAT, TOO MUCH HEAT, OVERFEEDING, DRY AIR or DROUGHTS. To pinpoint the cause, look for other symptoms.
This is generally due to the use of CALCIUM in the compost of lime-hating plants or the use of HARD WATER for water such plants
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