Rumex graminifolius

Lamb.

Grass-leaf Sorrel

Polygonaceae Edible: Leaves Potential hazards — see below 37 iNaturalist observations

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Summary

Rumex graminifolius, common name grassleaf sorrel, is a species of the genus Rumex and the knotweed family Polygonaceae.

Description

A short perennial reaching 0.1 m tall with a 0.5 m spread, featuring dioecious flowers requiring both male and female plants for seed production. Wind-pollinated and not self-fertile. Accommodates light sandy, medium loamy, or heavy clay soils with mildly acidic to basic pH. Grows in semi-shade to full sun and prefers moist conditions.

Edible Uses

The leaves can be eaten raw.

Medicinal Uses

None known.

Known Hazards

Plants can contain quite high levels of oxalic acid, which is what gives the leaves of many members of this genus an acid-lemon flavour. Perfectly alright in small quantities, the leaves should not be eaten in large amounts since the oxalic acid can lock-up other nutrients in the food, especially calcium, thus causing mineral deficiencies. The oxalic acid content will be reduced if the plant is cooked. People with a tendency to rheumatism, arthritis, gout, kidney stones or hyperacidity should take especial caution if including this plant in their diet since it can aggravate their condition.

Distribution

It is a temperate plant.

Where It Grows

Europe, North America, USA,

Cultivation

We have very little information on this species and do not know if it will be hardy in Britain, though judging by its native range it should succeed outdoors in most parts of this country. Dioecious, male and female plants must be grown if seed is required. The following notes are based on the general needs of the genus. Succeeds in most soils but prefers a deep fertile moderately heavy soil that is humus-rich, moisture-retentive but well-drained and a position in full-sun or part shade.

Propagation

Sow seed in spring in a cold frame. Once seedlings are large enough to handle, prick them out into individual pots and plant out during summer. Can also be propagated by division in spring.

Other Uses

No dye data specific to this species has been recorded, but roots of many plants in this genus yield dark green to brown and dark grey dyes without the need for a mordant.