Some of the Welsh folk traditions from which the Celtic Garden grew reach back into prehistoric times even perhaps to the end of the last Ice-Age when land to the west was submerged. Stories were written down by medieaval monks that up to then had been spoken by generations of bards and storytellers.

The Celtic Garden has also grown from Wales' cultural landscape, its wooded valleys, rugged hills, waterfalls and lakes. Trees cover landmarks that were created before Wales and England existed; hillforts, dykes and burial mounds from the time of small Kingdoms which emerged in the dying days of Roman Britain.