Well-dressing is an ancient custom associated with Ascension tide, when English villages (mainly in the Derbyshire and Staffordshire areas) give thanks to God for the gift of water. The local wells are 'dressed' in elaborate floral pictures. These pictures usually tell a story from the Bible or perhaps the life of a saint connected with the village.
From May to September - time and dates vary depending on the area.
For details see the Well Dressing Calendar 2011.