The tree was starting to decay by 1768; William Cunningham, 13th Earl of Glencairn ordered the affected portion cut away and the wound filled with boiling pitch. Cunningham is also said to have added chains to the tree to strengthen its branches, which may well be the origin of the chained Wallace myth. The chains were subsequently partially encapsulated by the tree as it grew. Some of the surviving chain has been dated to the late-19th or early-20th centuries.[1]
In 1962 the tree was the subject of an article in the Greenock Telegraph which described efforts to save it. Despite this the tree fell during a storm in 1995. Some of the remains were taken to the nearby Gourock Ropeworks yard for safekeeping and some left in situ. A dendrochronological analysis of some of the remaining timber dated it to 1786. It is thought that this segment would have been from approximately 2 metres above ground level, which would date the start of the growth to around 1762. it is possible that this section was from regrowth stimulated by Cunnigham's intervention in 1768. An analysis of older sections of the trunk could not be carried out but may well be several hundred years earlier.[1]
In October 2019 planning permission was applied for to construct a monument to the oak in the grounds of the church. Designed by the local firm Nicholson McShane Architects, it would comprise a granite representation of a split tree trunk with a metal chain around its base.[2] The memorial was unveiled on 23 October 2021.[3] The last remaining part of the fallen oak was moved and put on display at Hunterston Castle, ancient seat of the Clan Hunter, in August 2022.[4]