Keeping cool at the Chelsea Flower Show. Yui Mok/PA May 23, 2014 Green your garden, help the environment and lower your bills Tijana Blanusa, University of Reading and Leigh Hunt, Royal Horticultural Society The Chelsea Flower Show is in full bloom. The UK’s annual botanical extravaganza celebrates all aspects of horticulture and is an important venue for watching emerging trends in the gardening world. But…