A true cottage garden perennial, hollyhocks are grown fir their lofty spires of trumpet-shaped blossoms. The tall plants are perfect for softening picket fences or creating a vibrant backdrop garden. Single blossoms grow 8-13cm (3-5") wide on plants that often reach over 200cm ( 6 1/2') in height! Sow seed outdoors by the end of July for flowers the following spring.