Posted: 26/06/2016 at 07:45
To add to what Buttercup has said, the Campanula and the Heuchera will appreciate some shade as well, so keep the sunniest bits for the real sun lovers.
I agree with obelixx too - you don't want a line of plants which are all the same height and shape, so place them ,in their pots, before you put them in the ground. You may still have to move some, because your own conditions mean some plants will grow more, or less, than the average, as the height and width guides are just that - a guide.
Elizabeth Oliver is a beautiful plant. I had it in a previous garden. If you can plant it somewhere high and/or near a seat, you'll be able to really appreciate it