Success story A giant attack on invading New Zealand pygmyweedBackground New Zealand pygmyweed (Crassula helmsii) is an invasive aquatic plant, originally introduced to the UK as an excellent water oxygenator, which rapidly spreads and dominates its environment. It kills native species by forming an impenetrable mat of stems which regrow quickly and do not die off in winter. Known to thrive in slow moving water such as ponds, reservoirs and

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