The hollyhock (Alcea rosea) is a stately garden favorite, known for its towering spikes reaching 5-8 feet. 1 Large, heart-shaped leaves adorn the strong stems, which burst into bloom from June to August. 2 Cup-shaped flowers, often 3 inches wide, appear in a vibrant array of colors like pink, red, purple, yellow, and white. These blooms, single or double, attract pollinators. 3 The plant produces disc-shaped fruits containing numerous seeds, often leading to self-seeding. 4 Hardy and preferring sunny spots with well-drained soil, hollyhocks bring a classic cottage charm.