'Alpina Clematis' #1 Gallon Pot Size

Clematis alpina is a very hardy, early flowering vine with an abundance of bright purple/blue flowers and then goes on to make interesting seed heads in late summer. 

It is perfectly suited to growing in pots due to its slower growth. Something really important is that the base of the plant must stay in the shade. Plant other flowers around the base to cover it and keep it cool. If the base is in direct sun, as in, if sunlight will hit the root collar, then cover it with for example an old tile or a few odd rocks.