'Rubra' is a variety of cut-leaved windflower with magenta flowers, that is a bit taller and more ornamental than the species. It is as hardy as the species. It is a small, delicate plant, so care must be taken not to plant to vigorous plants around it. It grows best in well drained, fertile soil in sun or partial shade, but it can tolerate less favorable conditions. It can be lost if the shade is too deep or the soil too dense.