Agrostemma githago — corn cockle — is a Eurasian native that followed grain cultivation across Europe for centuries, once a common weed of wheat fields before modern seed-cleaning all but eliminated it from working farms. It has since become a cutting-garden favorite instead: tall, wiry stems carry single magenta-pink flowers with narrow petals and faint dark veining, held above silvery, grass-like foliage. Popular strains include 'Milas' (deep magenta) and 'Ocean Pearls' (a paler pink-to-white mix).
It is a true hardy annual — direct sow into cool soil in very early spring, or in fall in mild climates, for the largest plants and earliest bloom; it resents root disturbance and does not transplant well. The seeds, and to a lesser extent the leaves, are toxic if ingested — historically responsible for livestock and human poisoning when they contaminated grain — so keep it away from grazing animals and out of reach of pets. Once established it self-seeds readily.
Damping Off
Seedlings collapse at the soil line with thin, water-soaked stems; seeds may fail to emerge or rot before sprouting.
Sow in well-draining mix, avoid overwatering, and ensure good airflow. Remove affected seedlings and let the surface dry between waterings.
Root rot
Plants wilt, yellow, and stunt even in moist soil; lower stems and roots turn brown, soft, and mushy and the plant may collapse. Most common in heavy, wet, or poorly drained ground.
Improve drainage and stop overwatering, and never plant too deep. Lift and destroy badly affected plants along with the soil around the roots. Grow in raised or free-draining beds to prevent it returning.
Rust
Orange to brown raised pustules on the undersides of leaves, with yellow spotting on the upper surface. Heavy infections cause leaves to yellow and drop.
Remove and destroy infected leaves. Avoid overhead watering and improve air circulation. Apply a sulfur or copper-based fungicide if it spreads. Clear plant debris in fall.
Powdery mildew
White or grey powdery coating on leaves — usually starting on older growth in humid conditions or when nights cool.
Improve air circulation by thinning plants. Apply neem oil or potassium bicarbonate spray at first sign. Avoid overhead watering.