Guilandina bonduc, commonly known as Grey Nicker, is a vigorous, thorny liana native to tropical coastal regions, mangroves, and disturbed areas across the globe. It can grow to lengths of over 20 feet, often sprawling over the ground or climbing over other vegetation with the aid of its curved spines. The plant features large, compound leaves and produces inconspicuous yellow flowers followed by seed pods that contain large, grey, marble-like seeds known as nickernuts, which are often found washed up on beaches.

Grey Nicker is valued for its hardy seeds, which are used in jewelry and crafts. It is also used in traditional medicine and has been studied for its potential pharmacological properties. In cultivation, it requires well-drained soil, moderate water, and full sun to partial shade. Due to its aggressive growth and potential to become invasive, it is not commonly used in gardens but may be found in botanical collections or as a curiosity in private gardens. Care should be taken to control its spread, especially in tropical and subtropical regions outside its native range.CC BY-SA 4.0