Answer: I would first check the soil before I planted any other vines. Most vines like a well drained, fertile soil. Amend your soil with compost before planting and that should help. Also clematis may take a year or so to build up their roots and shoots especially if your weather is severe, windy and changes often (does that sound like Utah!). If you want to try other more vigorous vines on your pergola try growing honeysuckle, wisteria, Dutchman's pipe or even grapes! All should grow in your area but they will take over the pergola eventually if that is the look you want. You can keep the clematis growing with these others and actually it looks quite nice interplanted that way.
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