Museum Blogs

As the National Slate Museum continues its major redevelopment programme, an important community of residents remains very much at the heart of our plans - our bats! 

Working closely with ecologist Carola Hoskins of SK Environmental Solutions ltd, we’ve been carefully monitoring and protecting ten known bat roosts across the site. 

These roosts are home mainly to common and soprano pipistrelle bats, two of the smallest bat species in the UK. 

Seven of the roosts are used by individual males or non-breeding females, but one is particularly special - a soprano pipistrelle maternity roost that supports around 65 bats at its Summer peak.

A Safe Place for New Life

Although the colony is currently winter hibernating elsewhere, by late April the bats will begin to return. 

At this time around 35 females will settle into the maternity roost and by late May or early June, each Mother gives birth to a single pup doubling the colony size almost overnight. While 65 bats might sound like a lot, it’s a relatively small maternity colony for soprano pipistrelles, making every individual important.

One of Nature’s Cleverest Adaptations

“Bats have many remarkable traits, but one of the most fascinating is delayed fertilisation." said Carola. "Female bats mate in autumn, but they delay pregnancy until spring, storing sperm through the winter months. This ensures that pups are born at exactly the right time when warmth, food, and safe roosting conditions give them the best chance of survival. It’s one of the many reasons these tiny mammals are so well adapted to life in the UK."

Conservation at the Heart of Our Redevelopment

Because bats and their roosts are legally protected, all redevelopment work involving the roofs at the Naional Slate Museum or potential bat habitat is carried out under licence, and only during winter while the bats are away. 

Carola is working alongside our Museum and Construction teams to guide every step of this process, by ensuring that roost entrances remain open, structures remain suitable, and the bats can return safely each spring.  This careful approach allows us to progress with essential redevelopment while safeguarding a species that has lived alongside the museum buildings for generations.

The National Slate Museum redevelopment project is funded by The National Lottery Heritage Fund, UK Government via Cyngor Gwynedd as part of the Llewyrch o'r Llechi project, Welsh Government including the Community Facilities Programme, the Wolfson Foundation, Garfield Weston Foundation and other funders. We are extremely grateful to all our funders for their support.      

Una is undergoing essential repairs at Boston Lodge, the engineering works of the Ffestiniog & Welsh Highland Railways. In December and January, a group of volunteers spent a couple of weekends offering their time to help with the task! 

Una the engine was built in 1905 by the Hunslet company of Leeds and worked at Pen-yr-Orsedd until about 1960, being used mainly to haul wagons of rubble inside the Quarry. Sadly, she failed her safety tests a few years ago and has had to remain out of action since then - much to the disappointment of staff and visitors.

This opportunity to help with the repairs has been a part of the collaboration between Ffestiniog & Welsh Highland Railways and the National Slate Museum, as we knew people would jump at the chance to be a part of Una’s story! 

Over the course of two weekends, several volunteers helped to sand, scrape, clean and prepare metalwork from Una, ready for repainting. This is an essential part of restoring Una and ensuring the steam engine is preserved for future generations, as fresh paint helps protect the metal. 

"The day I spent working on Una has led to me pursuing the opportunity to volunteer on other projects within the Northwest Wales Slate Heritage Site... I really enjoyed the day" 

- David, volunteer

A big thank you to all those who came and contributed their time on cold winter weekends! It was wonderful to share Una’s story and see everyone’s passion shine through. 

As work continues with Una, we hope to offer more opportunities for people to engage with the journey! Join our mailing list to ensure you are kept up to date with the latest opportunities: 

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The project is funded by The National Lottery Heritage Fund, UK Government via Cyngor Gwynedd as part of the Llewyrch o'r Llechi project, Welsh Government including the Community Facilities Programme, the Wolfson Foundation and The Garfield Weston Foundation and other funders. We are extremely grateful to all our funders for their support. 

January is traditionally a quiet time. The thrill of the festive season has passed, and we all wait eagerly for the end of winter, but it is also a time for new beginnings. 

At St Fagans, we’re starting the year off with a bang! Over the next few months, you’ll notice lots of activity around the museum while we deliver projects to improve the visitor experience including: 

• Updating the play area 
• Re-roofing St Fagans Castle 
• Revamping Siop Losin and introducing a new range of products 
• An exciting redesign of the shop in the main building 
• Developing a new coffee shop in Gweithdy 
• Renovating the toilet block near Rhyd-y-car Terrace 

Your visit will be different during this time, and some areas will be closed. We’ll keep you updated with developments as they happen. 

Thank you for your patience while we undertake this work - we promise you it’ll be worth it! 

If you’d like to stay up to date with the latest news, you can sign up to our newsletter or follow us on social media. 

Winter might seem like a quiet time in the gardens, but there's still plenty happening behind the scenes. As the days grow shorter and colder, the gardening team gets to work preparing for the season ahead. Some of the busiest areas are the Castle gardens, where we prune roses and trees, mulch the beds, and cut back the hedges.

The castle itself is surrounded by tall, thick yew hedges. These create ‘garden rooms’, small, enclosed spaces with different themes, hidden from one another. This style was especially popular in the Edwardian period. Each space had its own character, and the hedges and walls created a sense of surprise and discovery around every corner.

In the past, these hedges were trimmed entirely by hand but thankfully, we now use electric hedge cutters too!

We also work on the avenue of lime trees leading to the castle, which were planted in 1901. These are pollarded - a special way of pruning that involves cutting off the upper branches while keeping the main trunk. It’s hard work, but it helps maintain their striking shape and keeps the trees looking much as they would have done over the past century.

In the cottage gardens, we begin putting the gardens to bed for winter. This means cutting back spent plants, tidying the beds, and digging over the soil, much to the delight of the local robins, who follow us closely in the hope of finding a worm! We also add well-rotted manure to enrich the soil, helping us grow healthy, strong crops in the year ahead.

Another important job is harvesting materials for our Christmas wreaths. Each year, we make traditional wreaths to decorate the doors of our historic houses (you can read more about this in our online article from last Christmas!). To do this, we use natural materials gathered from around the museum grounds.

We coppice hazel and willow to make strong, flexible bases for the wreaths. Coppicing is a traditional and sustainable woodland practice, where young stems are cut back to ground level so that new shoots can grow. It was once a common method in Welsh gardens and woodlands. We also use other bendy plants like wisteria and crimson glory vine, which has beautiful curly tendrils that look lovely emerging from a wreath.

Even though the flowers have faded, there’s still plenty of magic in the gardens. Frost glitters on the seed heads and stems we’ve left standing to provide food and shelter for wildlife. Bare branches dusted with lichen create beautiful patterns against the winter sky. Red berries glow in the low sunlight. And if you’re lucky, you might even catch sight of a kingfisher swooping low over the ponds through the morning mist.

There’s still so much to see and enjoy as we head into winter in the St Fagans gardens.

I know, archaeology is not something you would automatically associate with the Slate Museum – it’s usually geology! But in December, three volunteers joined us to take part with the archaeological surveying required for the enabling works of the redevelopment project at National Slate Museum, Llanberis.

Archaeology Wales were commissioned to survey and record two features at the Gilfach Ddu workshops, where the museum is based. They were recording a post-1970s staircase in the Foundry, and original railway tracks outside in the yard. This surveying is required due to the Gilfach Ddu workshops being a listed building, and to ensure anything changed during the redevelopment project is recorded. The staircase is being replaced with a more accessible and safer design, whereas the railway tracks will be replaced once drainage has been installed beneath them. 

Three volunteers, Nicola, Donna and Shay, joined buildings archaeologist Emily to draw and photograph these features, creating a permanent record for the future. This provided volunteers with a good base of knowledge of buildings archaeology and how to survey features by drawing and photographing. It also gave a great opportunity to learn about the Slate Museum redevelopment and the improvements being made. 

DIOLCH Nicola, Donna a Shay! 

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The project is funded by The National Lottery Heritage Fund, UK Government via Cyngor Gwynedd as part of the Llewyrch o'r Llechi project, Welsh Government including the Community Facilities Programme, the Wolfson Foundation and The Garfield Weston Foundation and other funders. We are extremely grateful to all our funders for their support.