These beautiful and useful foliage plants add structure and texture to the garden. Their exotic-looking foliage creates a lush tropical feel to planting and many varieties have bright acid green flowers in spring and early summer that add a bit of zing to a border and beautifully compliment purples and blues. There are many varieties to choose from, whether for height or ground cover, sun or shade. Here’s my pick of the best. E. characias wulfenii This is probably the most popular euphorbia. Its stems of bluish green leaves (up to 1.5m high) provide year round rounded structure to the garden and look great with silvers and purples. From March it comes alive with with blowsy lime green flowers that perfectly complement blue and purple plants such as Erysimum ‘Bowles Mauve’ or alliums. It will tolerate some shade but prefers a sunny spot and is pretty drought tolerant once established – perfect for a gravel or Mediterranean garden. E. characias ‘Humpty Dumpty’ is a more compact version of wulfenii – growing to around 50cm. Good …