Galeopsis speciosa, commonly known as Large-flowered Hemp-nettle or Edmonton Hempnettle, is an annual herb native to a variety of habitats including disturbed sites, roadsides, and field margins in northern and central Europe and Siberia. It typically grows to a height of 20-60 cm (8-24 inches) and is characterized by its square stems and opposite leaves. The plant produces showy pink to purple flowers with a distinctive nettle-like appearance from mid-summer to early fall, which are attractive to pollinators such as bees.

Large-flowered Hemp-nettle is not commonly cultivated due to its toxic properties, which can cause paralysis if ingested. However, it can be found in wildflower mixes for naturalistic plantings and is sometimes used in traditional medicine despite its toxicity. It prefers full sun to partial shade and grows well in a range of soil types, provided they are well-drained. Due to its invasive potential, it should be managed carefully to prevent spread outside its native range.CC BY-SA 4.0