Thuja D1 Phytophthora. Big word. Big threat. More than 200 threatened plants are at risk from Phytophthora cinnamomi, a soil borne plant disease that affects the roots of plants. Its impact is often called 'dieback' Rhododendron yakushimanum 'Best Late' Rhododendron fr Garten Thuja occidentalis Smaragd pflanzen Gardline Weihnachtsstern pflegen & schneiden Liebe deinen Garten Rhododendron luteum growing in a pot in the Spring garden