purple deadnettle Identification (Lamium purpureum)

Check the plant’s low, soft-stemmed form and clustered flowers first.

• Square stems branch from the base and usually stay under 12 inches (30 cm) tall.
• Leaves grow in opposite pairs, are broadly triangular to heart-shaped, and have bluntly scalloped edges.
• Upper leaves are crowded near the stem tips and often show a reddish-purple flush.
• Small tubular flowers sit in tight whorls at the upper leaf nodes, with a hooded upper lip and a 3-lobed lower lip.

Look for several of these traits together before deciding.

Purple deadnettle shows clear visual shifts from low seedling rosettes to flowering, branched stems.

• Seedling: Starts as a tiny basal rosette with opposite round to kidney-shaped leaves on long stalks; stems are short, and upper leaves are not yet crowded.
• Young plant: Begins producing square, ascending stems and paired leaves along the stem; newer leaves become more triangular and toothed than the first rounded leaves.
• Mature plant: Forms a low, branched mound about 4-12 inches (10-30 cm) tall, with upper leaves packed near stem tips and often flushed purple.
• Flowering stage: Top leaf pairs tighten into a compact cluster around small tubular pink-purple flowers, which sit in whorls at upper nodes rather than singly.

Purple deadnettle is often easiest to spot from late winter into spring, when its upper leaves turn distinctly purple and small pink-purple flowers become obvious near the stem tips. In warmer periods it may keep flowering, but the purple top growth and clustered flowers are the clearest seasonal identification clues.

Several mint-family weeds are often mistaken for purple deadnettle.

Lamium purpureum is native to Europe, western Asia, and North Africa. It is most often found in disturbed ground such as gardens, field edges, roadsides, vacant lots, and open woodland margins. That setting helps with identification because this species commonly appears as a weed in low, human-disturbed places rather than in wetlands, deep shade, or dry rocky slopes. Finding it in cultivated soil or along paths can narrow the options.