Malva hybrids -- 'Cheeses; Cheese Weeds', Tall Mallow Malvaceae Kristin Yanker-Hansen, Danville. Native to Europe and N. Africa, M. sylvestris has a number of named cultivars in white to blue or pale purple. Seeds will produce a mixed batch. They tend to be biennials or, again, "weak" perennials. It grows to 3 plus feet, but there are low growing forms only 8 inches high. The flowers are about 1.75 inches across.