A summer, annual plant that can cope with winter well. The purple dead-nettle is a common weed found in most crops. It is considered a very competitive plant. It competes with the crop to get its nutrients from the soil, as well as water and space in the field. Farmers will be happy to note that controlling the purple dead-nettle is not a difficult task. Emergence and development recorded throughout most of the growing season. Low temperatures do not hinder it. It feels best in clay and rich soils full of valuable nutrients.

The purple dead-nettle is seen in ruderal settings, in baulks and along roads. Due to the visual similarity it can often be mistaken for the stinging nettle. It blossoms in the spring and if autumn is warm. Can grow to a height of 5-30 cm. The speed of growth is high, which is related to the necessity of undertaking actions. Recommended spraying with a herbicide suitable for the crop.