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Yellow Rattle, Cockscomb
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Lamiales
Family: Orobanchaceae
Genus: Rhinanthus
Species: R. minor
Binomial name
Rhinanthus minor
L.

Yellow Rattle or Cockscomb (Rhinanthus minor) is a flowering plant in the genus Rhinanthus in the family Orobanchaceae, native to Europe and western Asia.

Close-up of the flowers

It is a hemi-parasitic herbaceous annual plant that gains some of its nutrients from the roots of neighbouring plants. It grows to 25-50 cm tall, with opposite, simple leaves, with a serrated margin. The flowers are yellow, produced on a terminal raceme. The fruit is a dry capsule, which contain loose, rattling seeds when ripe; the plant's name refers to these. Its preferred habitat is dry fields or meadows, where its flowering period is between June and September. In Ireland and Scotland, this species is often associated with Machair habitat.

Research at the UK's Centre for Ecology and Hydrology has shown that encouraging Yellow Rattle to grow in hay meadows greatly increases biodiversity by restricting grass growth and thereby allowing other species to thrive. The seeds are spread very effectively by traditional hay-making practices.

It can be cultivated by scarifying the surface of the ground with a fork or similar, then sowing onto short grass, 0.5 to 1 gram of seed per square metre. Yellow Rattle seed is short-lived and should always be sown in the autumn, using seed harvested that year. Then, keep grass short for beginning of March when seedlings establish. Thereafter, the grass should not be cut until the end of July to allow the Yellow Rattle to flower and go to seed, then cut short.

References

Westbury, D.B. (2004) Rhinanthus minor L. Journal of Ecology, 92, 906-927.

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