Couch grass (Elymus repens) is a stealthy invader that creeps underground through tough, wiry rhizomes and can spread several metres in a season. It is also known as twitch grass. It can be tricky to ...
A compact, semi-evergreen marginal aquatic perennial, comprising fans of leaves making clumps to a height of 30cm, with narrow mid-green leaves, striped golden-yellow ...
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