As usual, it depends on your soil, sun or shade. Let us have a few more garden details and we'll reel off a list!

If by best you mean easy care and long flowering season you might find my blog on this helpful

http://www.growsonyou.com/anchorman/blog/12681-plants-with-a-very-long-flowering-season

( If you don't know how to put that link into your computer just click on my user icon ,then blog and then look for my blog entiteles "plants-with-a-very-long-flowering-season")