The Shelton Oak was pictured in Jacob George Strutt's 1822 book Sylva Britannica.[3] In 1823 it was recorded to be at least 41 feet 6 inches (12.65 m) high; 44 feet 3 inches (13.49 m) in circumference at ground level and 27 feet 4 inches (8.33 m) at a height of 8 feet (2.4 m). It was also noted that the hollow trunk had "sufficient room for, at least, half a dozen to take a snug dinner".[4] Until 1824, when it was sold, the land the oak stood upon was owned by the Mytton family.[5] A report from this year noted that at a height of 1 foot 6 inches (0.46 m) the circumference of the oak was 37 feet (11 m) and at 5 feet (1.5 m) the circumference was 26 feet (7.9 m).[1] It was noted at this time that the hollow trunk could accommodate 20 people.[6]
During the early 19th-century a plaque was erected at the site that read: "On July XXII AD MCCCCIIII OWEN GLENDWR ascended this Tree to reconnoitre, on his march to Shrewsbury, to join the daring Hotspur, against King Henry IV; but, finding his friends were defeated, returned from this spot into Wales" (the date and year stated here, 22 July 1404, are not those of the actual battle).[7] The tree was also known at this time as "Owen Glendwr's Observatory" and the "Glendower Oak" due to its association with the legend.[5][7] An acorn from the tree was planted by the gate of Pentreheylin Hall by a Mrs Croxon in 1832 and was flourishing more than 40 years later. A report from 1878 suggests that the hollow trunk of the Shelton Oak was by then large enough for eight people to dance a quadrille within it.[8]
A second acorn from the tree was grown into a sapling and planted at The Elms in Shrewsbury by Dr Charles Waring Saxton on 5 February 1880.[5]
By 1884 the tree was said to be "in a complete state of decay, and hollow, even in the larger ramifications". The tree had died by 1940 and the stump was removed in the 1950s to allow improvements to take place to the adjacent junction of the A5 and the Welshpool Road.[2] On 27 January 1981, a replacement oak tree was planted by Mayor of Shrewsbury Jean Marsh on the verge adjacent to the site of the original. Shropshire Council opened the Mytton Oak Remembrance Park in 2014 and planted a descendant of the Elms oak tree (therefore "grandson" of the Shelton Oak) within its grounds.[5]