Answer: Layering is usually the most successful route with clematis but I've heard from gardeners who have rooted them in water and in wet florist's foam. The key is humidity around the cuttings (which you'll get with an open vase or glass of water or with florist's foam). I'd continue to coax your cuttings into developing roots by simply leaving the plants alone (aside from replenishing the water as it evaporates). I'll bet they'll root in another 2-3 weeks. Good luck with your project!
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