Girth measurements of trees can generate interesting
comparative data, but this becomes even more compelling when the occurrence of ancient
and veteran trees is linked with local history. Read on….
There are 3 large Yew (Taxus
baccata) trees in the cemetery of the (now) Baptist Church of St John the
Baptist in Glyncorrwg (right of centre in photo above). Two of these
trees have been classified as veterans by the Ancient Yew Group. As a
guideline, a Yew tree with a girth (measured at a height of 1.5 metres = 5
feet) between 4.9 metres and 7.0 metres is classified as a veteran. Anything
bigger than that is regarded as an ancient tree. The largest of the 3
Glyncorrwg trees had its girth (circumference) at a height of 1.5 metres
measured as 6.63 metres in 1998. A measurements made today, i.e. 15 years
later, was 6.73 metres, which is very close to the 1998 figure.
However, as noted by the Ancient Yew Group,
this tree has split into two trunks and this makes comparative measurements problematic.
The individual trunks are about 4.0 metres in girth and the bole below the
split is more than 6.0 metres in girth. Clearly, this is a big tree, which can
be categorised as veteran. This means that it is probably older than 500 years
and less than 1,200 years old. Comparing exact measurements within categories is fairly
meaningless because the errors and confidence limits associated with the relationship
between girth measurements and tree age are very large. But, placing trees in
categories is important. The Ancient Yew Group gives expert guidance for this.
The other 2 Glyncorrwg trees are smaller, (measurements
today - 3.68 metres and 3.85 metres), but one of them has a significant portion
of its trunk missing. All 3 trees are surrounded at their bases by their own
stone retaining wall, which appear to have been added (or restored) in recent
times. Consequently, the lower portions of the boles of the trees seem to be
buried in soil.
The earliest record that I can find of the Glyncorrwg Yews
is from a document written by Nicholas Carlisle in 1811, who wrote ‘In the Church-yard of Glyncorwg (sic) , are
five remarkable Yew Trees, the largest of which (in 1810) measures 10 yards 4
inches in circumference.’ There are a number of interesting things here. Firstly, we have the date, which is more
than 200 years ago. Secondly the girth of the largest tree (given as 30 feet) is just over 9 metres. Such a tree would be categorized as ancient, i.e.
over 800 years old and probably over 1,000 years old, or more. Thirdly, there were 5
trees! In other words, 2 have gone and it looks as if one of them was already an
ancient specimen 200 years ago. Interestingly this tree was recorded as ‘still
there’ in 1933 by Hyde and Harrison (Welsh Timber Trees, 1977), so there may be
someone in Glyncorrwg who can remember it.
So how does this match up with local history? The church in
Glyncorrwg cemetery (St John the Baptist) appears to have a long
pre-reformation history. Although most
of the church as it stands now is about 100 years old, it also has a medieval
history. The current building, rebuilt
in 1907, has the original east window, holy water stoup and font derived
from the earlier church, estimated to be about 600 years old. In fact some
evidence links the original church with the Cistercian Abbey at Margam. All this is consistent with the occurrence of
veteran trees that are still there. But what about that ancient tree? Perhaps it was planted
by the monks in the 12
th century, but, perhaps it was even older
than that. Could it have been planted by Celtic Christians? The church’s web
site (
www.parishofglyncorrwg.co.uk/)
suggests that the structure and location of the cemetery indicate a Celtic
origin. Fascinating stuff!