This document discusses several common gardening myths that frustrate horticulturists. It notes myths such as mowing grass shorter requiring less frequent mowing, weed barrier fully preventing weeds, always pruning roses to the first five leaflets, Epsom salts being universally good for plants, watering on hot days scorching leaves, more sun always benefiting plants in winter, evening watering conserving water more, and only being able to install plants in spring.