5 (10)cm, Heart-Leafed Globeflower is a winter hardy, evergreen perennial with short woody stems and a prostrate, cushion forming habit with leathery, shiny leaves. It is native of rock crevices in the Alps and makes floriferous mats with pale lilac-blue flowers. Easily cultivated in any rich, well drained soil in a sunny to partially shaded spot. Excellent in the rock garden. USDA climate zone 6. V-VI.