Rhododendron luteum growing in a pot in the Spring garden Thujahecke mit braunen Trieben Zulauf Gartencenter Thuja occidentalis Smaragd pflanzen Gardline 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' Thuja: Pflege, Giftigkeit & Vermehrung Plantura Grow Your Snake Plant 3x FASTER!