An annual with several sticky, hairy stems growing 10 to 50 cm tall, swollen at the nodes where leaves attach. The bright green leaves are thread-like in whorls of 6 to 10, about 2.5 cm long, rounded on the upper surface and grooved on the lower surface.
Flowering begins in July. The small flowers are less than 5mm long, with five white petals and open in sunshine. They grow in clusters and are produced on slender stalks about 12 mm long. Egg-shaped seedpods hang down to disperse the seeds when they ripen in July - August. Corn spurry can produce mature seeds ten weeks after germination.
Not a widespread weed in gardens and is easily uprooted.
Killed by most weedkillers.

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