Tundra plants are small (usually less than 12 inches tall) and low-growing due to lack of nutrients, because being close to the ground helps keep the plants from freezing, and because the roots cannot penetrate the permafrost.
Plants are dark in color---some are even red---this helps them absorb solar heat.
Some plants are covered with hair which helps keep them warm.
Some plants grow in clumps to protect one another from the wind and cold.
Some plants have dish-like flowers that follow the sun, focusing more solar heat on the center of the flower, helping the plant stay warm.
