If you are looking for a plant that is great for beginners or you forget to water your plants, try growing string of buttons (Crassula perforata). String of buttons is a succulent with square or triangle-shaped leaves that create a spiral shape around the plant's stem to give it a stacked appearance. The gray-green leaves can take on a pink hue when exposed to sufficient light. Plant this fast-growing succulent indoors or outdoors in the spring and summer. Crassula perforata is toxic to humans and animals.