Answer: Unfortunately I am unable to think of anything that meets all of your criteria. Clematis are generally lighter vines and are available in many shades of purple and pink but would not be 20 feet long. Trumpet vine is available in orange tones and quite huge but also very heavy. Climbing roses that reach 20 feet would not be reliably hardy in your area -- and also extremely heavy. Wisteria is way too strong and very heavy also, although it would certainly meet the size and color requirements with ease. Annual morning glories might work well for you if it is a very sunny spot, although they do not reach 20 feet until the end of the summer. Your local professional garde staff and/or county extension may have some suggestions based on a more detailed understanding of the growing conditions and your overall design goals. Good luck with your project!
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