Giant or Chilean Rhubarb (Gunnera tinctoria) is a perennial non-native invasive species, listed on Schedule 9 of the Wildlife and Countryside Act . The species is particularly frequent along the banks of watercourses, and is becoming a real nuisance in the UK and Ireland.
Individual leaves can reach 2.5m in diameter, have prickly, thick stems, and large cone shaped erect flower bundles (inflorescences) in early summer.
The number of seeds is estimated from 80,000 per seed head to 250,000 per plant.
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