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Here in MN climate like yours are some that I grow: Claire de Lune, Elsa Spath, Hagely Hybrid, Killian Donahue, Ramona, Roguchi and Duchess of Albany among others but this will give you an idea of some that like our climate.
They do take a couple of years to get established the first year they settle in, the second year they start creeping up their support, the third year they take off and look pretty good. You have to be patient for a couple of years at least here they will not take right off and bloom the first year. This forum has lots of information on how to plant and fertilize. I would not recommend a clematis to a beginning gardener as it does require patience and most beginners want it now.
I so agree they are most definitely worth the wait. I recently took a picture of Claire de Lune it is still loaded on the camera. This was it's best year so far it is planted in partial shade one that will do well there.
Smellthis, I have 'President', 'Lime twist', 'jackmani', 'pink champagne', and 'snow queen'. The last two I got at Menards this year on clearance. I also have seed from 9 other varieties (pirl, is it too late to start those tis year?)
Check Menards, HD and if you hve one, Lowes, for clearance. They should all be well suited for your yard.
Hi from the Frost Zone! I am answering this from work, so just speaking off the cuff. I have lots of clems in my z3-4 garden and they really do vary in their growth rate and habit. Some are just tougher, more vigorous, or more free-flowering than others. Pink Fantasy was blooming by Memorial Day. Elsa Spath has huge flowers. Etoile Rose has beautiful nodding bells of cherry red with a dark pink reverse. Blue Bird blooms just the once in spring but the lacy vine is glorious and the flowers are so pretty. Warsaw Nike has very deep purple-red blooms.
I have definitely had my failures though. Queen Josephine struggled along for 4 yrs or so and finally croaked. She just never seemed to get going. PPE is spindly for me. Triternata did not 'take'. I planted a whole bunch last summer and I just have not had time to study which ones are doing the best...working lots of overtime. I have the weekend off, so hopefully I will get out in the yard and look at the markers and refresh my memory.
One thing I would say is not to overlook some of the non-clinging varieties. They make beautiful pillars rambling up an obelisk or cage. I love Petit Faucon (absolutely carefree for me), and I have another that I can't name off the top of my head that is 6' tall as a 2nd yr plant. Somewhere I have a post of the pillars I made out of tomato cages...simple, pretty and cheap! The only tool neded was a pair of pliers.
I am thrifty by nature and good clems are not generally cheap. Debbie at Silver Star Vinery has awesome plants that have wonderful roots. She is also a great resource to steer you toward those clems that might be better in your setting. She is closing very soon for the season, but she was having a sale... www.silverstarvinery.com I have also heard good things about Dan at Brushwood