Cold places tend to have lots of snow, and have long periods with little light, so the plants can be buried for much of the year and need to be able to cope with very low light conditions. Mosses and lichens are common in the artic tundra.
It explains how the plants adapt to survive, so in the arctic, only plants with short roots can get the necessary nutrients from the ground, because it is frozen. Conditions are much worse in the antarctic where there are only two native plants – both grasses that survive on the coast
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