A recent survey by the Tree Register of the British Isles found some of the biggest trees in Britain are growing in the grounds of Plas Tan y Bwlch, Snowdonia.
In all, the environmental centre is home to four UK champion trees and nine Welsh champions.
One of the UK Champions is an enormous Red Cedar which comes originally from Japan.
The other UK champions include a Golden-leaved Lawson Cypress, a Sawara Cypress and a Variegated Holly Olive Tree.
The Welsh Champion trees include a Downy Birch, a Katsura Tree, a Sawara Cypress, Japanese Red Cedar, Pocket Handkerchief Tree, Oriental Spruce, Chinese Rhododendron, Smith’s Rhododendron and Silver Lime.
Andrew Oughton, Head of Business at Plas said: “We have long been aware of the magnificence of the trees at Plas, but had no idea so many of them were the biggest of their kind. Such is the wealth of trees around us, garden consultant Tony Russell is currently preparing a book on the principal trees of Plas Tan y Bwlch’, which will be published shortly.”