Hordeum vulgare aka Barley

Hordeum vulgare, or barley, is an annual cereal grass. It belongs to the grass family, Poaceae. Its native range spans the eastern Mediterranean, Central Asia, and China. People first domesticated barley in the Middle East. Farmers now grow it across the world for grain and forage. It is one of the oldest cultivated cereal crops.

Barley grows fast and has an upright form. NC State gives heights of 1–4 feet [0.3–1.2 metres]. RHS gives a taller range of 3.3–4.9 feet [1–1.5 metres]. Spread ranges from about 0.3–1.6 feet [0.1–0.5 metres] across these sources. Green stems bear narrow leaves in an alternate pattern. The leaves feel papery and have no hairs. Their bases form sheaths around the stems. Plants reach their full size within one year.

Green flower spikes appear in summer and sway on upright stems. Each flower is small and lacks showy petals. The heads and grain turn pale gold to brown when ripe. The dry grain is a fruit called a caryopsis. Growers use the grain for flour and beer production. RHS links two-row barley with malt and six-row barley with feed. The seed heads also suit dried flower arrangements. Their upright shape gives garden plantings a clear outline.

Grow barley in full sun and soil that drains well. It accepts clay, loam, sand, and chalk. It also tolerates acid, neutral, and alkaline soil. NC State favours moderate soil fertility and warns against flooding. Soil may stay moist or become dry at times. Sow seed where it will grow in spring or autumn. Plants need no pruning. RHS rates barley H6 for UK hardiness. PFAF lists USDA zones 2–10 for this species.

Home gardeners can sow barley in autumn as winter cover. It suits vegetable plots, orchards, and permaculture gardens. Its growth helps limit weeds and protect soil from erosion. Digging its roots and shoots into soil adds organic matter. Barley does not fix nitrogen, unlike legumes such as clover. It does not host Hessian fly, which benefits following wheat crops. RHS reports few routine pest or disease problems. NC State notes a risk from southern root knot nematode. The grain is edible, but these sources give no species-level toxicity assessment.