At Blair Castle, the gardens span centuries of aristocratic vision and botanical exploration, most notably in Diana's Grove — an extraordinary landscape planted in the 18th and 19th centuries with trees collected from across the globe. Here stand some of Britain's tallest trees: a Grand Fir measured at 62.7 metres, the tallest Japanese Larch in the country at 44 metres, and a magnificent Red Fir at 39 metres — all introduced from North America, Japan, and other far‑flung regions. The Hercules Garden, laid out around 1750, was one of Scotland's great formal water gardens, with terraces, ponds, and classical sculpture; restored in recent decades, it reflects the 2nd Duke's ambition to create a landscape that combined European design with newly introduced exotic trees. Together these gardens represent successive waves of botanical discovery, bringing conifers and ornamentals from the Americas, Asia, and beyond to grow in the Highland soil.