Many cacti and succulents have developed strategies for surviving cold temperature extremes, and are known as cold-hardy plants. Plants like Echinocereus and Opuntias begin to lose their water content as the weather gets cooler, signaling the coming of winter. Some plants can lose 40% or more of their water and the tissue of the plant becomes more like a raisin (shrinks). This is because freezing causes the tissues to be damaged if their is a lot of water inside the plant, but in this state, that’s not the case, allowing the plant to survive freezing temperatures.
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