This mod includes many new flowers that you obtain by breeding vanilla flowers.
To obtain the flowers you need to make a pollen jar that is created by using 3 glass panes like you was making a glass bottle. By right clicking a flower with the pollen jar to get the color and then right clicking another flower with the pollen jar to get a seed. This seed can be planted on farmland and will grow like very other crop.
This mod is great for decoration!