Equisetum telmateia
The tallest species outside tropical regions, the Great Horsetail is native to the UK and is capable of producing stems to at least 1.5m tall if well fed and moist. Magnificent dark-banded green stems clothed in linear, very fine foliage. Fertile stems rise to 45cm in spring before the foliage. Safest kept in a large pot, stood in a tray of water.