The living wall at Siam Paragon, Bangkok - from Weatherstaff PlantingPlanner

You know the scenario – you’re wandering around the garden centre, a horticultural show, a friend’s garden, and there’s this gorgeous little plant you desperately need to own. So you buy it (or dig up a clump if offered or take a few seeds). Your own garden is bursting at the seams. There is no room for a single extra plant, but how many gardeners are staunch minimalists who will stoically turn their backs on that enticing little plant?

So the borders are bulging with delicious combinations of plants and you dig up more lawn for an extra bed. You plant up huge flower pots and hanging baskets. You drape fences with climbers – perhaps even cover the shed roof...

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