A small tribute to the Synergy maypole: In Britain and Ireland, the maypole was found primarily in England and in areas of Wales, Scotland and Ireland which were under English influence.
Although the earliest recorded evidence comes from a Welsh poem written by Gryffydd ap Adda ap Dafydd in the mid-14th century, in which he described how people used a tall birch pole at Llanidloes, central Wales. Literary evidence for maypole use across much of Britain increases in later decades, and "by the period 1350-1400 the custom was well established across southern Britain, in town and country and in both Welsh-speaking and English-speaking areas."
The practice had become increasingly popular throughout the ensuing centuries, with the maypoles becoming "communal symbols" that brought the local community together - in some cases, poorer parishes would join up with neighbouring ones in order to obtain and erect one, whilst in other cases, such as in Hertfordshire in 1602 and Warwickshire in 1639, people stole the poles of neighbouring communities, leading to violence. In some cases the wood for the pole was obtained illegally, for instance in 1603, the earl of Huntingdon was angered when trees were removed from his estates for use as maypoles without his permission.
You can read more in the wikipedia article here.