Buddies

I will soon have some more flowers in the garden; these are growing by the back door in a pot and are big and blue. I know what this one is, it begins with A, but I'm not sure what order the other letters come in.
We bought this years ago whilst on a holiday in the Isle of Scilly (fabulous place, totally different from anywhere else I've been). They grow like weeds there in the hedgerow. Must be strong, I have not killed it yet.