Too little humidity might also cause black spots to form on leaves. If it's a tropical plant with a high humidity requirement, increasing misting. Too little humidity: If the browning is confined to the leaf tip, and the leaf margin is still green, it's possible the plant isn't receiving enough humidity.This most often happens from the bottom up, but it might also start on outer leaves on bushier plants. Too little water: Underwatered plants will first wilt, and then the leaves will brown and fall off.If the rest of the leaves are healthy, introduce some airflow to cool down the plant. If the plant is also wilting, increase water. Too much heat: This often occurs in conjunction with too little water, but too much heat will cause leaves to curl, become crinkly and then fall off.Over time, the plant will form a bare stem. This happens to many kinds of tropical plants as they grow. Keep in mind that it might be perfectly natural for the lower leaves on your plant to first turn pale yellow, then turn brown and drop off. If the discoloration is isolated to the side of the plant away from the light source, it's probably receiving too little light. Even with the best care, brown leaves are fairly common on many houseplants. Not enough light: If lower leaves start turning brown or yellow, the plant might not be receiving enough light.The Spruce Home Improvement Review Board.
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