Common corncockle is naturally found across temperate regions of Europe, North Africa, Western Asia, and Central Asia. It has been introduced to many parts of the world, including regions in South America, Africa, East Asia, and some North Atlantic islands. Although no longer widely cultivated, common corncockle has a presence in many areas outside of its native range.

Common corncockle poses moderate toxicity risks to cats and dogs if ingested, particularly the seeds containing triterpenoid secondary metabolites. Symptoms for both include gastrointestinal upset and lethargy. Immediate veterinary care is crucial if ingestion is suspected. Poultry are highly vulnerable, but humans face only mild toxicity as the toxins aren't well absorbed when consumed. Household animals generally aren't susceptible.

Common corncockle originates from Europe, particularly the Mediterranean region. As a weed, this plant exhibits an exceptional ability to reproduce, an attribute commonly associated with weeds. It rapidly proliferates by producing copious amounts of seeds, even in unfavorable conditions, which allows it to spread quickly and dominate a garden. Moreover, it's harmful to gardens and crops. A notable characteristic that contributes to its harmfulness is the presence of toxic compounds in its seeds, which may lead to poisoning if the seeds are ingested by livestock or humans. Moreover, it's tall and tends to overshadow nearby plants, causing them to wither due to lack of sunlight. Spotting common corncockle in your garden is usually straightforward due to its unique look: bright pink or purplish flowers with five petals, and oblong, pointed leaves. It's primary means of spreading is via their seeds, which can easily scatter with the wind, and can also stick to animals, machinery, or clothing, therefore it's important to control its growth effectively.

To manage common corncockle, it is important to take action before it sets seed, which typically happens in late summer.