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Cacti are fleshy plants that store water, making them part of the succulent group. This group of plants are remarkable for their fleshy stems which serve to store water, prickly or hairy coating, and very few, or rarely any leaves. Due to these unique characteristics, you can almost easily identify a cactus just by its appearance. Generally speaking, all cacti are considered succulents but not all succulents are considered cacti.