Posted: 03/03/2014 at 12:19
Just for information, only one of the varieties mentioned is actually a British native wild flower - the Knautia arvensis. Centaurea cyanus is not native, and any found in the wild are probably garden escapes.
I agree with Hollie, you do have time to make a new border, and you can start off the seeds in small pots or modules to plant out later. They will do much better like this than trying to grow them in a large pot, in my experience.