They will grow best with cool moist roots and plenty of sun. They'll grow in most types of fertile soil. They are fairly easy to grow but are susceptible to various diseases and also to pests so they can be a little high maintenance. There are many different colour varieties, from white to lilac, pink and rich burgundy. The flowers are usually large and star shaped. This variety, 'Etoile de Paris' was hybridised by Christen in 1885 and has large, showy blue flowers.
This post is part of the Blue Monday meme,
and also part of the Macro Monday meme,
and also part of the Through my Lens meme,
and also part of the Seasons meme.