Trees and bushes that lost their leaves over the winter begin to grow new leaves again and also flower in spring.
This happens because the temperature of the air and soil starts to warm up and the hours of daylight increase as the days get longer with the coming of spring. Plants need light to make food to grow and reproduce.
Some trees produce blossom or catkins before their leaves appear. Other trees grow new leaves first. The trees need to have flowers if they are to produce seeds or fruit. The flowers on trees are pollinated by insects such as bees or the wind.
