- This plant has a Plant Risk Evaluator rating of Moderate Potential Risk
Lamiastrum galeobdolon is a member of the mint or deadnettle family (Lamiaceae). It is an herbaceous creeping perennial with square, hairy stems that can grow up to 1-2 ft. tall. It is native and widespread in Europe and was brought to North America for ornamental purposes, where it has been planted throughout the Northeast and mid-Atlantic, as well as the Pacific Northwest.
It blooms in late spring with yellow flowers and fruits set in June to July. It is a prolific seed-producer. It can spread aggressively in optimum growing conditions. It is a noxious weed in King County, Washington.
'Hermann's Pride' is a clump forming cultivar that grows 2 ft. tall and wide, with leaves marked with white spots and streaks. 'Variegatum' has trailing stems that will root as they spread.
Lamiastrum galeobdolon has been found escaping cultivation in only a few locations in California, from Santa Cruz County north to Humboldt County, as it prefers moist soil and a milder climate. See Calflora for a map of its current distribution in California outside of cultivation.
Why is this plant not included on the invasive plant list?
Lamiastrum galeobdolon was included in the 2017 nursery survey as a candidate plant. It was only found at 3 nurseries (1 %) and all plants found were either the 'Jade Frost' or 'Variegatum' cultivar. Plants must be found at 3% or more nurseries during the survey to be added to the invasive plant list.
For more information about this plant, please see the following resources: