Yellow archangel is a ground cover with bright yellow flowers and green foliage marked with silver in some cultivars. It can be a very aggressive grower and should be sited carefully.
Size and Method of spreading:
Yellow archangel grows up to 1 1/2 feet high and can spread rapidly. It is a trailing-rooting ground cover. Trailing-rooting ground covers have trailing stems that spread out from a central root system. These stems spread out horizontally over the ground and can root where they come in contact with the soil. New shoots will be formed at the point where rooting occurs.
Native geographic location and habitat:
Native to Europe and Iran.
The opposite leaves are somewhat ovate to heart-shaped with coarsely toothed margins. Leaves of the species may be dark green or green marked with silver. Commonly sold cultivars have foliage distinctly marked with silver.
The irregular, yellow flowers are held upright on stalks. They are produced in late spring and early summer.
Fruit are small nutlets and not ornamentally important.
Yellow archangel is adaptable to a wide range of conditions. It does best in shade with good moisture. It can tolerate full sun as long as the soil moisture is adequate. Yellow archangel does not tolerate dry soils. This is a very aggressive spreader and should be sited carefully.
List of pests, diseases, and tolerances:
No common serious problems.
Florence yellow archangel (Lamiastrum galeobdolon ‘Florentinum’):
A taller cultivar, this plant reaches up to 20 inches high in flower. It has variegated foliage.
Herman’s Pride yellow archangel (Lamiastrum galeobdolon ‘Herman’s Pride’):
A shorter cultivar at12 inches high, this plant has silvery foliage with green veins.