Blue flowers always seem to be enticing to gardeners, especially the sparkling metallic-blue of the sea hollies. The intensity of the blue-colouring varies between species and can change with growing conditions. In general, the bluest flowers are on plants grown in poor soils in hot conditons. I find, though, that E. x zabelii is consistently blue, even crowded in the border and growing in rich soil. The name is given to hybrids of E. bourgatii and E. alpinum. The plants available for sale are variable but are characterised by strong, dark blue stems and large blue bracts with a dark-blue central cone.
It flowers during July and August and gets to about 75cm. It needs well-drained soil in full sun