The Walled Kitchen Garden
Walled kitchen gardens were once to be found all over the UK. They produced fruit and vegetables not only for the family and their guests, but also for the staff in the house and on the estate. Depending on the size of the establishment and the depth of the owner's pocket, the gardens varied in size from one acre to anything up to 12.
A number of gardens were even larger - in some cases covering more than 20 acres, such as the Duke of Portland's garden at Welbeck Abbey, and the Royal Kitchen Gardens at Windsor. These very grand gardens were usually subdivided by additional walls in order to increase the walled areas for fruit and to provide greater protection from the elements.
There has never been a survey of the whole country, but there would have been thousands. For example, a survey of Herefordshire made by the Hereford and Worcester Gardens Trust, found 157 walled gardens still extant, although it can be estimated that around half that figure has been lost.