Corn Gromwell

buglossoides arvensis

Corn Gromwell (Buglossoides arvensis) is a hardy, annual herbaceous plant native to Europe and Asia, now widely naturalized across North America and Australia. Traditionally found growing alongside cereal crops, this modest member of the borage family (Boraginaceae) is recognized by its small, funnel-shaped white flowers and stiffly hairy stems. While once dismissed purely as an agricultural weed, Corn Gromwell has recently captured the attention of nutritional science due to the exceptionally high concentration of beneficial omega-3 fatty acids found in its stony seeds. Its resilient nature allows it to colonize disturbed soils, farm borders, and dry waste sites, making it a common but often overlooked participant in rural and urban ecosystems alike.

Habitat: Typically found in cultivated arable fields, farm borders, dry waste ground, and along sunny roadsides.

Appearance

Corn Gromwell is an upright herb growing up to 50 cm tall, characterized by its rough, bristly stems and lance-shaped, grayish-green leaves covered in flat, stiff hairs. In late spring and summer, it produces tiny, inconspicuous white or pale cream flowers, roughly 3 to 4 mm in diameter, with five distinct lobes nestled in the upper leaf axils. Following flowering, the plant produces distinctive, hard, wrinkled, brownish-gray nutlets that closely resemble small pebbles.

KingdomPlantaePhylumTracheophytaClassMagnoliopsidaOrderBoraginalesFamilyBoraginaceaeGenusBuglossoides

Corn Gromwell

Interesting facts

Corn Gromwell seed oil is a highly sought-after plant source of stearidonic acid (SDA), an omega-3 fatty acid that the human body can efficiently convert into EPA.

Historically, the red pigment extracted from the outer layers of its roots was used as a rustic, cheap cosmetic rouge.

The hard, stony seeds of the plant resemble tiny gravel stones, which inspired the genus name Buglossoides (formerly grouped under Lithospermum, meaning 'stone-seed').

Special abilities

Produces highly mineralized seeds rich in calcium and silica, rendering them exceptionally hard and durable against environmental stressors and seed predators.

Entirely covered in stiff, appressed bristly hairs that deter crawling herbivores and significantly reduce moisture loss in dry environments.

Seeds can remain dormant but viable within the soil for several years, germinating opportunistically when the soil is disturbed.