"The habits of a weed determine to a great extent the best mode of fighting it. Certain remedies suggest themselves for creeping perennials like quack grass and toad flax while different treatment is best for narrow-leaved dock; and still a different mode of attack may be adopted for crab grass and purslane. Weeds are annuals as pigweeds crab grass purslane; biennials as bull thistle and mulleins; perennials like quack grass Canada thistle ox-eye Daisy"