Flower-class sloop

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The Flower class comprised five sub-classes of sloops built under the Emergency War Programme for the Royal Navy during World War I, all of which were named after various flowers. They were popularly known as the "herbaceous borders", in humorous reference to a well-known adage about the Royal Navy ("Britain's best bulwarks are her wooden walls"), as well as to a type of garden arrangement popular in the United Kingdom.