Campanula portenschlagiana varieties/hybrids
Is anyone here familiar with different variations of Campanula portenschlagiana? I'm trying to work out if it's possible to tell them apart from characteristics like flower colour, leaf variations etc.
Mainly I'm looking to identify the more vigorous varieties to use as a quick ground cover, but I'm aware some are bred to be less vigorous, or for longer flowering periods etc.
Some garden centres simply label them as Campanula, but a lot of the named ones seem to crop up now and again (Resholt's variety, and Clockwise I see a lot at the moment). Even the descriptions I find online can be a bit vague so I'm trying to compile a list of the ones I see the most and their particular strengths/habits (although I've only got as far as writing their names at the moment ).
Thanks in advance!