When a million-strong swarm of ladybirds landed on Blackdown Horticultural farm recently, every time the staff ventured outside they were coated in insects. But the red cloud brought good publicity for their enterprise:  green roof installation.

The swarm had arrived to feast on aphids living on pesticide-free sedum plants, a staple of green roofs since these succulents are drought-resistant and thrive in well-drained conditions. Continue reading Green roofs →