Essex,
United Kingdom 
why have my clematis plants died back
Asked from the GoYpedia
clematis plants page
2 Aug, 2010
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Unfortunately, it may well be Clematis wilt, which strikes a plant suddenly. The best way is to cut back all the dead stems to the base. It may well send up new shoots if you planted it deeply, either this year, or in the spring.
2 Aug, 2010