Dwarf citrus trees are especially well-suited for container growing. Improved Meyer Lemon, Bearss Lime and Oroblanco Grapefruit are three great varieties for growing indoors. You can grow citrus trees in any type of clay, ceramic or plastic pots. Choose a pot that is slightly larger than the pot the tree came in. The new pot needs to be deep enough to provide room for the roots to expand and to provide stability for the tree as it grows. The new pot must have a drain hole, so you’ll need a saucer under the pot to catch overflow. Next, choose a potting soil with good drainage and a pH around 7. Your new citrus tree needs as much sunlight as possible, at least 6 to 7 hours daily. If you don’t have a bright, sunny spot, you can still grow citrus indoors by supplementing natural light with plant grow lights. Water your tree frequently enough to keep the soil moist but not soggy. Generally, when the top 2" of soil is dry, it's time to water your tree. If you're unsure of how wet or dry the soil is, consider buying a moisture meter. You can quickly check the soil and know whether it's time to water. Keep an eye on the saucer below the plant and empty any excess water out of the saucer.