The way I understand it if you leave the roots in the ground (in moderate climates only it appears) they will re-sprout the following year and you will get beans earlier than you would by planting new seeds. One of the places I read said that the crops on the renewed vines aren't as heavy, but that they will come back for a number of years.
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Elizabeth
If I'm going to water and care for a plant it had better give me food, flowers or shade. 
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