Yellow archangel Lamium galeobdolon Lamium galeobdolon 'Hermann's Pride'Photo/Illustration: Courtesy of White Flower Farm 1 2 3 4 5 6 7 8 9 10 11 Yellow archangel (Lamium galeobdolon) LAY-mee-um gal-ee-OB-doe-lon Synonyms: Galeobdolon luteum Genus: Lamium This rhizomatous perennial has erect or creeping stems and silvery leaves. In summer, it produces spikes of yellow flowers spotted with brown. A less invasive cultivar is 'Hermann's Pride'. Noteworthy Characteristics: Very invasive. Care: Grow in moist but well-drained soil. Control spreading habit by digging out rhizomes. Propagation: Divide in autumn or early spring. Problems: Downy mildew, powdery mildew, leaf spot, slugs, and snails. Overview Height 1 ft. to 3 ft. Growth Habit Spreads Growth Pace Fast Grower, Invasive/Aggressive Grower Light Part Shade to Full Shade Moisture Medium Moisture Characteristics Showy Foliage Bloom Time Summer Flower Color Primrose Yellow Foliage Color Variegated Foliage Uses Beds and Borders, Ground Covers Style Woodland Garden Seasonal Interest Summer Interest Type Perennials Lamium galeobdolonView the discussion thread.