Cotyledon - Hardy drought tolerant, easy to grow outdoors or as container plants. Ideal for the Australian Mediterranean climate. Cotyledons have recently been assessed to having 10 to 11 species it was much larger group incorporating Adromischus, Dudleya, Tylecodens, and others, which now have their own individual genera's. Cotyledons are small prostrate plants to medium sized shrubs to 2 meters. All have succulent leaves and thickened stems.