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I don't know how high that fence is but the scarlet runners (a very old variety) will go as high as you want and when they run out of things to cling to, will turn back on themselves and create a great tangle of vines. They make a very good screen and have beautiful flowers. Don't let the beans get too big before you eat them, they become very tough in the later stages (or leave them on the plant to dry out and you'll have plenty of 'seed' to plant next year). Personally, I think scarlets have the best flavour of all the string beans, way tastier than green and yellow bush beans, which are tasteless in comparison. If you plant all three together, they will climb over each other in their race to the top and you will have quite a thicket. Morning glories will re-seed themselves year after year if you let them.
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