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.
My favorite edging - Steel. Its strong, bends, changes color, you can seal, paint it, takes up minimal space, can be recessed or use to create steps. My 3 recommendations, 1- dont use a thin (gage) steel because it will bend when people step on it or to thick that you cant work with it . 2nd if your budget is tight check a local metal shop, see if they have cut scrap pieces you can buy. 3rd hammer the furtherest corners of your edging to be safe.
Watch A Gardener's Diary on hulu.com - A beautiful terraced garden in Portland, Oregon