All trees are grown on site at Trebrown Nurseries' sites and are fully traceable, from seed source to planting site. Due to the biosecurity risks involved, we do not import trees or purchase trees from UK nurseries that import live plants. This removes the risk of cross-contamination of our trees. The British Native Trees category includes the Native trees (been here 8000+ years), and the Archaeophytes (been here before the year c1500). The Commercial Forestry category list trees suitable for timber production, so includes many Natives & Archaeophytes, but also Non-natives, and can be both Controlled FRM or Non-FRM. As the name implies, the Exotic & Ornamental list is just that. We retain the Fern Spore list by popular demand from our old website, and those are the only items that can be sent outside Great Britain.