Even if you think you can’t draw or paint, it is a good habit to have. Drawing plants is a very easy thing to start with.  They don’t move or need a rest.  You can practice on them for as long as you like before progressing on the more difficult subjects.  But many well known and skilled artists also used painted flowers, vegetables and trees.  So you are in good company.  Van Gogh’s sunflowers is one of the best known flower painting, painted in his idiosyncratic style-

(credit: Wikipedia)

You can use flowers and plants to develop your own style and experiment with colours, mediums and textures.  Here are some of my own work using water colours, pencils and even cherry juice.  They won’t be critical of your attempt at their portrait!