Pot size depends on the current size of your rosemary plant. In general, if you re-pot a plant use a pot that is one size larger. A pot that is too large may create the opportunity for too much water or fertilizer. Clay pots tend to evaporate water more quickly because of the porosity of the clay particles. This may benefit your rosemary plant by keeping it from becoming waterlogged. Fertilize lightly, as excess fertilizer will cause a reduction in flower and fragrance. A typical fertilizer used for houseplants should be sufficient.
To harvest the plant, pick small amounts as needed, but do not remove more than 20 percent of the plant at one time. Avoid cutting into the woody part of the plant unless you are shaping it. Cutting into the wood will hinder development. Rosemary is also grown as a topiary plant and can be trained to form unusual shapes.
