Blue Mountains Botanic Garden, Mount Tomah is located in the World Heritage listed Greater Blue Mountains on the summit of a basalt-capped peak, 1,000 metres above sea level. The 252 acre garden has a large collection of plants from around the world, particularly the southern hemisphere, and is the ‘cool climate garden’ of the Royal Botanic Gardens Trust.
Beth Chatto's Gravel Garden. Allium Nigrum and a very wide selection of allium bulbs in the UK, try Bloms. Cool colors in a hot garden: allium Nigrum is planted with veronica 'Kapitan', stachys byzantia, and a cristophii.