Tree Hollyhock. An erect shrub with toothed dark purple/green leaves and single purple flowers with a crimson eye from mid-summer to autumn. Height 1.8m. Spread 1.5m. Flower colour Purple, Crimson. Flowers from July to October. Deciduous. Foliage colour Green/Purple. Hardy. Planting instructions Back-fill with soil mixed with peat and a suitable fertiliser.