Jade plant (Crassula argentea), with its succulent, rounded, dark green leaves, is one of the most recognizable of all houseplants. If properly cared for, jade plants can live so long that they're passed down from generation to generation. Although caring for jade plants may seem intimidating, the key to success is proper watering. Like all succulents, the jade plant is susceptible to rot if the soil is too damp. On the flip side, too little water will cause the jade plant to drop its leaves.
Water the jade plant well, and allow the water to drain from the hole in the bottom of the container. Allow the top of the soil to dry somewhat between waterings, but don't allow the soil to become bone-dry.
Place the jade plant in a warm room, in temperatures between 65 and 75 degrees Fahrenheit. Nighttime temperatures between 50 and 55 are best.
Place the jade plant where it will be exposed to at least of six hours of bright sunlight every day. Don't put the jade plant too close to a window during the winter, unless the window is covered.
Fertilize the jade plant once every three months, and always water before fertilizing. Use a general purpose houseplant fertilizer, and apply it to the jade plant according to the manufacturer's recommendations.
Re-pot the jade plant only when it's absolutely necessary, as jade plants prefer to be slightly root-bound. Move the jade to a container one size larger, and use a potting mix formulated for cactus and succulents. If the jade plant is large, use a container with a wide, heavy bottom to prevent tipping.