Mainstay of classic cottage gardens, hollyhocks (Alcea rosea) are beloved for their towering flower stalks that can reach up to nine feet in height. Their dramatic spires display large, vibrant blooms across a wide spectrum of colors, creating a bold vertical backdrop along fences and garden borders. Easy to grow in full sun, these biennials attract bees, butterflies, and other beneficial pollinators to fill your garden with color and life all summer long.