Q: I need to repot my anthurium. Do I need to put a layer of stones in the new pot?
A: There is no need to put stones in the bottom of a pot. In fact, you harm the plant a bit by doing this. Soil in a pot has three zones of moisture from top to bottom: too dry, just right and too wet. A layer of rocks decreases the amount of potting soil in the pot and thus decreases the zone of appropriate moisture for the plant. All you need to do is cover the drain hole with a pot shard or a coffee filter, to prevent soil from escaping.