Bidens pilosa Seeds | Spanish Needles

Categories：Herb

Spanish Needles seeds (Bidens pilosa)

LATIN NAME: Bidens pilosa

COMMON NAME: Spanish Needles, Beggar’s Ticks

Plant Profile

Spanish Needles (Bidens pilosa) is a branching annual of the daisy family (Asteraceae), probably native to tropical America and now one of the most widespread weeds of the warm world. It grows 30-150 cm tall, with divided leaves, small white-rayed yellow-centred daisy flowers and black, barbed seeds that cling to clothing and fur. Despite its weedy nature it is a valued wild vegetable and folk medicinal across Africa, Asia and Latin America.

Science & Biotechnology

Like other members of the Bidens group, Bidens pilosa draws steady attention from botanists and plant breeders, who value the genus both as a subject of research and as a source of garden-worthy material. This dual identity has made it a useful case study in ethnobotanical research examining how cultural context shapes whether a given plant is seen as a nuisance or a resource. Its behaviour in gardens is well recorded, thanks to a long history in cultivation.

Uses & Benefits

Beyond its ornamental appeal, Spanish Needles has the practical versatility that makes a plant worth growing from seed year after year. In parts of Africa, Latin America and Asia, Spanish needles’ young leaves are foraged and cooked as a nutritious wild green, and plant also features in various regional traditional medicine practices. In gardens and farmland where it is not deliberately cultivated, however, it more commonly behaves as a persistent, fast-seeding weed whose barbed seeds are notoriously effective at hitching a ride on clothing and pet fur. Mature plants need little attention in a well-chosen position.

Spanish needles is a widespread folk herb for colds and urinary comfort, and its polyacetylenes and flavonoids are studied for antimicrobial and blood-sugar effects. In southern Africa the related blackjack is even eaten as a leaf vegetable.

Growing from Seed

Spanish Needles is one of those generous plants that come along well from seed. Sow seed directly into a loose, well-drained mix at a shallow depth, keeping it lightly moist until germination. Full sun suits this fast-growing annual well, and it typically establishes and self-seeds readily, true to its reputation as one of more successful weedy colonisers found across the tropics and subtropics worldwide. Use a loose, well-drained seed compost, sow evenly over the surface and cover lightly, and keep everything evenly moist in full sun. Prick the seedlings out once they are large enough to handle, grow them on in bright light, and plant out when conditions allow.

Our Take

Our honest take is that most people encountering this plant will be trying to get rid of it rather than grow it deliberately – if foraging its edible young leaves is your specific interest, that is a genuinely valid reason to keep some around, but go in with clear eyes about its weedy tendencies.

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