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"The Glastonbury thorn still blossoms about Christmas; frequently on Christmas Day. It also blossoms again in May. Aubrey, the Wiltshire antiquary, tells us that a Mr. Hinton grafted a bud of the Glastonbury thorn on a ordinary thorn at his farm-house at Wilton, and it also blossomed at Christmas. In Parham Park is a similar tree. This thorn is supposed to have been brought by some pilgrim from the East."
Map - Glastonbury
[Parham Park is in the South East, and I can not find Wilton Farm]