Browning of tip margins may result from drafts, overwatering, poor drainage, lack of water or lack of fertilizer. Keep the soil moist, but not soggy. Never allow the potting mix to dry out. Ample water is one of the essential factors in keeping Philodendrons
growing evenly with large uniform leaves. Philodendrons prefer high humidity, 60 percent or more, Make sure that all excess water drains. Overwatering causes root injury, which causes leaves to turn yellow and eventually fall off.