The succulent plants Sedum reflexum (known as the stone orpine) and Aeonium look lovely in terra-cotta pots. These hardy plants thrive on benign neglect -- requiring a sunny location, minimal water, and only the occasional feeding -- and are equally beautiful in a rock garden and planted in a container.
The stone orpine is a gray-blue succulent native to the mountains of Central and Eastern Europe. Evergreen and mat forming, it produces bright-yellow flowers in summer. The stone orpine is hardy in USDA Zone 6. The plant will grow to be four to six inches tall and will cascade a bit over the edges of the pot. To plant, cover the drainage hole of a container with a broken pot shard, and fill the container with a mix of 3 parts potting soil and 1 part #3 coarse builder's sand, to improve drainage. Plant the sedums at rim level, and fill with more soil mix, eliminating any air pockets. In hot weather, water the plants every 4 days or so, though less frequently when the weather is cooler.
The Aeonium is a member of the Crassula family and is native to the Canary Islands. These evergreen succulents have short stems and broad, dark-green leaves. They often grow on rocky cliffs and hillsides, and they require good drainage. If you have a large Aeonium, as Martha does, you can divide the plant into several smaller pots. Allow the cut stems or leaves to take root in sand, then transfer to a pot filled with the same sandy soil mixture as the sedums'. When planting Aeoniums, remember that the plant tends to be top-heavy, so weigh the pot down with stones before adding the soil mix. Plant the Aeonium, and fill all around with soil to just below the rim of the pot. Wait a couple of days for the plant to take root before watering.