The flower is the part of a plant which produces seeds. These then produce more plants. So the flower is the reproductive part of the plant. In the case of trees, the flower grows into fruit or berries. It is the fruit or berries which hold the seeds. If you cut open a fruit or berry you will see the seeds inside. Some trees have flowers which are hardly noticeable as they are very small or are the same color as the leaves. Other trees have very obvious and beautiful blossom, such as the almond tree. However, inner part of the almond the kernel which is the part we eat is the seed.