Hidden Time-Capsule of UK Biodiversity: 10,000 Plant Specimens Unlocked After Centuries
In a locked room at the Royal Agricultural University in Cirencester, Gloucestershire, sits a collection of more than 10,000 dried and pressed plant specimens. Some date back to 1797. One was collected by a geologist who corresponded with Charles Darwin. Until now, the only way to know what the collection contains was to pull open a drawer and read the handwritten label on each sheet.
All of that is about to change.
The RAU herbarium is being digitised as part of a £155-million national scheme to connect roughly a million specimens from 23 museums and herbaria across the UK into a central digital hub. Over two years, each specimen will be photographed, its metadata recorded, and its location data georeferenced — transforming what has been described as a hidden time-capsule of British biodiversity into an open-access scientific resource.
A Record Spanning Two Centuries
Herbarium sheets — plants pressed, dried, and mounted on archival paper — were first produced in Italy in the 15th century and remain one of the most durable methods of preserving botanical evidence. Properly conserved, they can last hundreds of years. Plant collectors typically gathered specimens at peak flowering, when the identifying features are most visible.
The RAU collection is unusual in being an early example established at an agricultural educational institution. Its earliest specimens date to the late 18th century, providing a continuous record of plant life in the UK spanning more than 200 years. Among the notable contributors is Samuel Pickworth Woodward, a 19th-century geologist who taught at the college and corresponded with Charles Darwin.
“Until it is digitised, and the metadata collated, we have no way, other than manually sifting through the handwritten sheets, to know exactly what the collection holds,” said Dr. Kelly Hemmings, associate professor in ecology at RAU. “This rich seam of data is effectively ‘hidden’ natural heritage.”
What the Data Will Reveal
For researchers, the value of the digitised collection lies in what it can reveal about how the UK’s plant life has changed over two centuries. Each specimen carries three critical pieces of information: the species, the location where it was collected, and the date.
Comparing these historic records with modern plant surveys can reveal shifts in flowering times driven by climate change, changes in species distribution as temperatures rise, and the loss of habitats due to agricultural intensification and urban development. The same data can inform habitat restoration projects by showing what species once grew in a given area.
“The RAU’s specimens give the location and date at which they were collected, helping us to piece together patterns of biodiversity change over the last two centuries,” Hemmings said.
The collection also has applications in genetics. DNA can sometimes be extracted from historic herbarium specimens, allowing researchers to trace genetic changes in plant populations over timescales that would otherwise be impossible to observe.
Unlocking the Drawers
The digitisation effort is about more than science — it is also about access. Most herbarium collections are held by universities and museums with limited capacity to accommodate visitors. A researcher who wants to consult the RAU’s collection currently has to travel to Cirencester, request access, and then physically examine each sheet one at a time.
Once digitised, the same data will be available to anyone with an internet connection: ecologists studying biodiversity trends, farmers planning hedgerow restoration, citizen scientists tracking local plant populations, and historians tracing the movements of 19th-century naturalists.
“Archives are only useful if we can get the information out of dusty drawers and into current research, teaching, and wider conversations,” said Cassie Newland, associate professor of cultural heritage at RAU.
The project is part of a broader push to connect the UK’s scattered natural history collections into a single, searchable digital network. For the RAU, digitisation means that 10,000 pressed plants — each one a snapshot of British wildlife at a particular moment in the past 200 years — will finally be able to speak to the present.
Sources
[1] “Hidden time-capsule of UK biodiversity being unlocked.” BBC News, 20 July 2026. https://www.bbc.co.uk/news/articles/cze9ee1yej9o