Smilax aspera is a perennial, evergreen climber with a flexible and delicate stem, with sharp thorns. The climbing stem is 1–4 metres (3 ft 3 in – 13 ft 1 in) long.[5] The leaves are 8–10 centimetres (3.1–3.9 in) long,[5] petiolated, alternate, tough, leathery, and heart-shaped, with toothed and spiny margins. It is a monocot with reticulate venation. The midrib of the underside of the leaf is also provided with spines. The flowers, very fragrant, are small, yellowish or greenish, gathered in axillary racemes. The flowering period in Mediterranean regions extends from September to November. The fruits are globose berries, gathered in clusters, which ripen in autumn. They are initially red, later turning black. They have a diameter of 8–10 millimetres (0.31–0.39 in)[5] and contain one to three tiny and round seeds. They are insipid and unpalatable to humans, but they are a source of nourishment for many species of birds.
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