Horehound
Marrubium vulgare

Petals white. Flowers all year, mostly summer and autumn.

Perennial spreading herb to 80 cm high. Leaves to 7 cm long, margins with rounded teeth; hairs on leaves and stems long and star-shaped. Fruit a burr with backward facing hooks. Seeds about 2mm long, with a roughened surface. Deeply rooted with woody taproot and fibrous lateral roots.