Agrostemma githago Seeds | Corncockle
LATIN NAME: Agrostemma githago
COMMON NAME: Corncockle
Plant Profile
Corncockle is a slender annual that once grew through every European grain field, its grey strappy stems standing a metre tall and opening magenta five-petalled flowers each morning that shrivel by evening. The buds are wrapped in long, comb-like sepals that give the plant half of its character.
Cleaner seed and herbicides have all but ended it as a field weed: it is effectively extinct in the wild and survives in gardens and meadow mixes. It grows easily in any open, sunny soil, flowering about three months after a spring sowing and seeding itself where the ground is left alone. The stems are sticky below each flower, a trait the genus shares with the campions, and the seed is black and roughly the size of a grain of wheat, which is how it once travelled in the crop.
Science & Biotechnology
Its seeds contain githagenin, a saponin bitter enough to spoil flour when the seed was milled with the grain, and food historians trace grain-cleaning practices through complaints about contaminated bread. That same chemistry made it an early casualty of seed-cleaning standards, which is why a plant once universal vanished within a few decades.
The flowers open at dawn and are finished by mid-afternoon, worked by day-flying insects in the cool morning hours; the plant is otherwise self-compatible and sets seed reliably even in a poor summer. The five pink petals are each marked with two shallow notches, and the long calyx teeth that sheath the bud are a field mark odd enough to identify the plant in winter. Museum collections of bread contaminants record it regularly into the twentieth century, after which the entries stop, a neat archival measure of how completely seed cleaning removed it.
Uses & Benefits
Today it is grown for its look and its story: a magenta flash through wildflower meadows and cottage borders, and a talking point about how agriculture reshaped its own weeds. It is also used in conservation-education projects that recreate historic cornfield floras.
Its seeds are not for eating and its foliage is not for the kitchen; it is grown for the garden only, and the saponin content is worth noting when children are about. Meadow-makers also value it because it dies down by August, leaving the later grasses to take the stage without competition or a second hoeing.
Growing from Seed
Sow it where it is to flower, since it resents transplanting: press the seed half a centimetre into raked soil in spring or early autumn.
Thin the seedlings to fifteen centimetres apart, water until they are established, and give full sun in ordinary soil.
Let a few plants shed their seed at the end of the season and the patch will renew itself, though in cold districts a fresh spring sowing is more reliable. On heavy clay, sow it into a raked ridge that sheds water, since its one weakness is a seedling drowning in a wet week.
Our Take
The cornfield flower that seed cleaning lost and gardens saved: easy, morning-bright and gone by afternoon, worth sowing for the story alone.
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