Annual, poisonous, highly variable seed-propagated weed germinating in late spring with a short, spindle-like taproot. Found on loose, humus-rich, slightly acidic, nutrient-rich, especially nitrogen-containing sandy and loam soils.
Cotyledons are ovate to round-oval, ends distinctly pointed, hairless, margins entire, petiolate, bases rounded, distinct midrib (Picture 1). True leaves are broadly ovate or almost triangular, margins entire to sinuate-serrated, petiolate, sparsely haired, dull dark green (Picture 2). Stems are dark-tinted at the base. Inflorescences are short-stemmed cymes composed of 5-10 flowers (Picture 3). The fruits are pea-sized and blackish-blue to greenish-yellow when ripe. The seeds contained therein are gray-brown, foveate (pitted), kidney-shaped, compressed (Picture 4). Each plant produces approx. 500 seeds.