Clematis don't do "Bare Root" well at all so avoid any that you find that way.

Silver Star Vinery ships large plants but all Clematis benefit greatly from hard pruning the first two years and none of them really get growing well until a few years have passed. Don't waste your money on huge plants. They are all set back by transplanting.....

Wow. Thanks for the recommendation. Silver Star is exactly what I was looking for. Thanks, Dorian

I have had success with bareroot clematis--I just pot them up and grow them out prior to planting them in the ground. My Harlow Carr, Rosemoor, and Wisely were all pathetically small plants purchased bareroot and they have developed into nice plants but it just takes time and growing them out in one gallon sized pots before planting in the garden.

Debbie at Silver Star Vinery does sell some nice gallon sized plants. The thing to remember is that clematis, regardless of the size of the rootball, will take time to get established in the ground and anyone expecting immediate gratification of large bunches of blooms and luxurious vines the first few years in the ground is setting themselves up for disappointment. As many of us here have said in the past, patience, pruning, proper planting, fertilization, purchasing the proper plants for your growing conditions and watering are the keys to ultimate success with clematis.