Answer: Clematis clings to things by twisting the stems of its leaves around any support it can find. I have one growing on some lattice but I would recommend a wire trellis because some of the flower buds open behind the lattice. In addition, I have had to attach it to the lattice where it didn't take hold. Clematis can get quite heavy if it is growing vigorously so the netting would not be appropriate. If your area has seen its last frost, you can set out perennial seeds. Call a local nursery to find out the average last date of frost but it should be around the middle of March. There are hydrangeas that are woody shrubs and shouldn't die back to the ground in your zone. You might try rhododendrons for that shady spot...but there are any number of native shrubs that would probably do well in the situation you describe. Contact a local nursery and ask for suggestions.
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