As creative elements of garden design, green roofs really took off in the late 1970s, and they grow in popularity each year.
In city centres they are an excellent way to utilise otherwise unused areas of buildings for our - and the planet's - benefit.
St Patrick's Day is a great day to celebrate Irishness in all its many forms. And a big part of that is the green-ness of the country. Recreate some of that lush Irish greenery, with a smart choice of plants.