The term for plants that grow in very cold climates is "cryophytes" or sometimes referred to as "polar plants." These hardy vegetation types have adapted to survive in extreme conditions common in polar or alpine environments. They often possess specialized features, such as small leaves or thick coatings, which help them conserve water and withstand harsh winds and freezing temperatures. Examples include mosses, lichens, and certain species of evergreen trees. Understanding these plants is crucial for studying climate change impacts in their habitats, as they serve as indicators of ecological shifts.