Hey Blondiesec, How long have you had those plants in? Have they been in long enough (a season at least) to have developed a good root system? And, apart from the various types you have, and seeing as autumn (fall) is approaching in the northern hemisphere. Look, I think I'd be looking for a good (reliable) publication on clematis for your climate (if there is one). I have 'A Guide to Clematis', by Dr John Howels, one time president of the British Clematis Society, and though a brief look at the species, it is a worwhile guide.

Hi Funnelweb, They are second year plants. Claire de Lune and Multi Blue have only been in the ground since April. They were very small when I got them last year so I let them develop in pots before I planted them in my garden. I should have at least 2 months before the first frost in my zone.

You shoud get a good bit of growth on them in that time, Blondie, I'm not sure of the pruning procedure on the ones you mentioned but I'll go through my guide when I go to bed tonight (soon) where I do a bit of reading before sleep time. Just gotta watch a bit of the Olympics first. Trust all is well where you are and that the American summer is not too hot and you're not bothered by bush fires. Heard it's another bad year in California!

Um, Blondie, the only one mentioned in my guide is Henryi. To quote: "Moderately vigorous, Height to 3m (metres) (10ft) Flower: 15-20 cm (6-8in): eight sepals; creamy-white sepals and brown stamens. Flowers early summer to early autumn. Ternate leaves. Pruning - LIGHT. One of the oldest hybrid clematis and comes from Scotland. He adds points on pruning: 1. Use secateurs or scissors, depending on the toughness of the shoots: 2. always burn shoots at once after pruning (must remember that) - this will reduce the risk of leaving spores of wilt around. 3. Never cut into strong woodie stems. Clematis don't like it and the plant is likely to give up the ghost. On pruning he says, the early flowering clematis require little pruning, the late flowering need hard pruning; early flowering clematis will flower on growth made the previous year, so, prune lightly in spring. Late flowerers flower on the previous season's growth, therefor prune hard early in the season which makes for good growth which will make for an abundance of bloom later in the season.
Hope that make sense!

Thanks for the info Funnelweb. I think I may leave them alone for this year. They are all looking healthy and growing. Should probably leave well enough alone.

Yes, we are having another typically hot and humid summer. By the way, I'm in South Carolina, not California. East coast as opposed to west coast for California. Hurricanes are the problem here instead of bush fires. So far the hurricane season has been fairly quiet, but we have several months to go yet.