This is a perennial with creeping roots. It grows as a rosette of arrow-shaped leaves with outward-facing lobes at the base. These distinguish it from Common Sorrel which has downward-facing lobes.
In May and June a flowering stem up to 60 cm high produces tiny green flowers which turn to red-orange (female flowers) or orange-yellow (male flowers) borne on separate plants; these are wind-pollinated.
It can be used in a similar manner to Common Sorrel for eating or as a herbal remedy.

Sheep's Sorrel forms a loose mat of roots which spread over a large area if allowed. Hand weeding is easy for a small infestation, but all of the fine, yellowish, rubbery roots need to be traced and removed. Any fragments remaining will soon regrow.
The regrowth is best treated with a systemic or translocated weedkiller such as Glyphosate to ensure more complete eradication. In the lawn it is killed by selective weedkillers - MCPA or 2,4-D - applied in late spring.

Nicholas Culpepper
(17th century astrologer-physician)
"Of great use against the scurvy if eaten in spring as salad."