Spring is the season after winter and before summer. The weather gets warmer because the ground is tilted towards the Sun. In many parts of the world plants grow and flowers bloom. Often people with hay fever suffer more, because of the allergens. Many animals have their breeding seasons in spring. In many parts of the world it rains for hours. This helps the plants, grow and the flowers bloom. At the start of spring, people suffering from seasonal affective disorder will feel better.