"Paint the season you are in." Here is a charming and detailed article on painting watercolor floral still life:
http://www.artistdaily.com/american-artist-magazine/featured-technique/watercolor-setting-up-and-painting-a-floral-still-lifehttp://www.artistdaily.com/american-artist-magazine/featured-technique/watercolor-setting-up-and-painting-a-floral-still-life