Searching for St Columba’s Yew on the isle of Bernera

An edited version of this article on SYTHI’s trip to the Isle of Bernera, funded by a Vicky Schilling Bursary, was published in the Tree Register Newsletter no.30 2021/22. 

Please also see an update on the situation at the bottom of this article.

Bernera is a tiny, uninhabited tidal island off Lismore in the Firth of Lorne. It was on Lismore in the 6th century the Irish Christian missionary St Moluag established his mission. He was a companion of St Columba and legend has it that St Columba (or perhaps St Moluag, or both) preached and created a cell on Bernera underneath a huge yew tree. It became popularly known as St Columba’s Yew.

The yew was felled in the 18th century by the Campbells of Loch Nell in Argyll and its wood used to make a staircase in their castle. The castle burned down about a century later, but the staircase apparently survived. However enquiries made with the current owners of Loch Nell discovered that the yew staircase was finally lost in a fire only a few decades ago. On the Loch Nell official website is a claim that the building stands upon a 6th century ‘Columban’ cell. (1) (2) (3)

Various reports were made in recent decades that the yew survived the felling and had regenerated in a creeper like manner along a cliff, but searches made by many people had failed to locate it. Enquiries made prior to the visit with our guide Bob Hay (author of Lismore: The Great Garden, Birlinn Ltd., 2015) had confirmed that there were some yews on Bernera, as he knew of two, but they appeared to be small bushes growing at the top of a cliff. Nevertheless the question was were either of these yews connected to the legendary yew. If so, and part of the post 18th century regeneration, it would mean they were part of a yew with a root system certainly 1,400 years of age minimum.

The yew was said to have been large enough in the 6th century to shade and shelter large congregations of people hence the size at that time implies a possible age of 2,000 years old today and perhaps even more. If so, this would put the age on par with the broad consensus that the Fortingall Yew in Perthshire is at least 2,000 years old and Robert the Bruce’s Yew at Stuc an T’Iobhairt, above the eastern shore of Loch Lomond south of Tarbert, said to be big enough 700 years ago to shelter King Robert and 200 of his followers, could also be 2,000 years old. That a yew can grow big enough to shade and shelter large numbers of people is proven today by the Great Yew of Ormiston, East Lothian. It is said that over 450 years ago this yew was used to gather sizeable congregations under its boughs to hear the radical ideas of the Scottish Reformation promulgated by George Wishart and John Knox.

Waiting for the tidal causeway to be shallow enough to cross.

Accessing Bernera is dangerous and only possible at low tide across a narrow neck of rough rocks with deeper water either side and should only be attempted with a guide, in our case Bob Hay of Lismore Heritage Centre, and Iris and Lorna of Explore Lismore. Even at low tide, as we found, strong winds can cause swells strong enough to knock a person off their feet and wading across such a short space is a precarious experience, moreover when carrying sensitive technology such as cameras and mobile phones. Waiting to cross in comparative safety meant the time window on the island was compromised and reduced to just over an hour. From the narrows a rocky path takes about 20 minutes to ascend and reach an area above a sheer cliff about 30 ft (10 metres) high.

Here two female bushes of yew growing about 10 metres apart poke through a tangle of thick vegetation including brambles and young trees which appeared to be ash (Fraxinus excelsior). It is not possible to get very close as the surrounding vegetation on the clifftop overhangs the sheer drop and is dangerous to explore. It is obvious that these two bushes are not creepers and have distinctive stems although these were not fully visible from the viewpoint. Given that previous searches in the 1990’s found this yew growth impossible to find is understandable as it may not have been as visible then as it is now.

Yew growth at the top of the cliff
Yew growth showing at the top of the cliff







As time was at a premium both to recross the tidal narrows and then drive to reach the ferry back to the mainland, Bob had suggested he left to retrace our steps and then divert to reach the shoreline beneath the cliff, so we could obtain an assessment of the site from below as well as above. Although the area at the base of the cliff is surrounded to some distance by thick undergrowth, he could confirm what looked like a trunk was growing from the cliff and the bushes were the tops of stems and not separate trees.

Looking up at the cliff from where the trunk of the original tree was cut. Image courtesy of Bob Hay.

The yew is historically described as growing from a cliff overhanging a level area leading to the shoreline. Nearby was a shingle beach where boats could be easily drawn up and the topography of the site fits this description exactly. The fact that both stems are female suggesting they are the same tree, is more supporting evidence that this was what we were looking for – St Columba’s Yew but also the Holy Yew of Bernera.

Given the well-known propensity of the pre Christian Druid culture to utilise trees or groves  to practice their beliefs and known to involve the yew, it is a possibility that this yew may have been known and utilised by the Druids as a sacred site prior to the establishment of the mission of St Moluag and , why archaeological investigation of the site is imperative.

Since the visit Bob has advised he will organise the clearing of the dense undergrowth at the base of the yew over the coming months and this will enable a look for archaeological evidence (Bob has extensive archaeological experience investigating the history of Lismore) that a monastic cell or retreat was indeed here as traditions maintain during the period of St Moluag’s and St Columba’s missions.

That St Columba had a profound spiritual relationship with yew trees is found in part of a verse attributed to him and written before his exile regarding a yew in his native Derry:

“This is the yew of the saints

Where they used to come with me together.

Ten hundred angels were there,

Above our heads, side close to side.

Dear to me is that yew tree;

Would that I was set in its place there!

On my left it was pleasant adornment

When I entered into the Black Church…” (4)

Leaving aside the anthropological significance to this yew, of most significance is that there is a yew on Bernera in the first place. Although Bernera and Lismore are unusual in that their geology consists mainly of limestone and not formed from the igneous rocks more typical of the west Highland region, this environment is exceptional for yews as it is fully exposed to the salt laden, Atlantic storm strength winds which continually batter the islands, and would typically induce slow yew growth. As Bob knowledgeably advised, trees are not traditionally popular in a long history of livestock farming on Lismore and Bernera “because they take up space” so yews may have been here and lost over many centuries. If so, that would make the yew on Bernera perhaps a sole survivor of a very ancient population. However, it could be the only yew there has ever been on Bernera and a result of avian seed dispersal however long ago. This is reasonable to assume, but is not quite so, as we found out.

A young yew growing separately from area of original tree

On our return from the site we were excited to find another yew on Bernera, a tiny bush growing atop a steep cliff a few hundred metres to the north-west of the main site. Given the other yew is female, evidence suggests this bush is a direct progeny of the other and a result of avian seed dispersal.

It is genuinely compelling to consider that what is said to have been a huge yew 1,400 years ago began life on Bernera in such a way, germinating upon a cliff and already in this case its life has been sculpted by the prevailing weather and possible nibbling by sheep. Not only has one example of yew regeneration apparently occurred on Bernera since the felling by the Campbells, this unexpected discovery is another. It is evidence suggesting the Holy Yew of Bernera has probably produced at least one successful offspring thriving as best it can in such a challenging habitat. This raises the possibility that further exploration of Bernera may find more and Bob will be investigating this exciting possibility in due course.







Following the brief but very fruitful September 2021 visit to Bernera as part of the Tree Register’s Vicky Schilling Bursary Award field research in Argyll, our guide on the trip Bob Hay returned in the summer of 2022. After clearing a way through dense undergrowth to reach the base of the cliff, he observed a small work of dry-stone wall which could be loosely described as a pulpit, though there is no archaeological evidence linking this stonework to the sixth century when Columba was active in the area. Above this area he noted some multi-stemmed yew growth on the cliff, the central area of which had stems of “probably about 20cm diameter.  On paper this does not seem to be big enough to be regrowth from a felling in 1770 as tradition claims. However…

The yew at Blarcreen House, Inveresragan on the Ardchattan priory estate overlooking Loch Etive in Argyll, lost a major branch about a decade ago. SYTHI were lucky enough to get a sample from it in 2021 of 21 cm diameter, courtesy of the occupiers of the house. It was sent for dendro-analysis to Toby Hindson of the Ancient Yew Group who confirmed a radial ring count of 250 before the core of the sample became too decayed to count any more.

This makes it feasible that a circa 20cm branch diameter at Bernera could be over 200 and up to 250 years old and would be the right age to be regrowth after the felling of the great yew in 1770 as claimed. If so, it’s not necessarily the case that regrowth has been slow on Bernera, as it seems to fit a local climatic growth rate in Argyll at Blarcreen House.