Hollyhocks are old garden treasures that rise like stately sentinels in the summer garden, their towering spires clothed in showy blooms from June through August. These members of the mallow family (Alcea rosea) grow 5 to 8 feet tall on rigid, unbranched stems that typically need no staking, creating dramatic vertical drama in hardiness zones 2 to 10. Though technically biennials or short-lived perennials, hollyhocks self-seed so freely that they establish enduring colonies in the garden, returning year after year as if planted intentionally. Their large, heart-shaped basal leaves and progression of smaller foliage up the spire create architectural interest even before flowers open, while their blooms, which appear from bottom to top, attract butterflies and hummingbirds throughout the season.
24
Full Sun
Moderate
2-10
96in H x 24in W
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Moderate
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Hollyhocks reach 5 to 8 feet tall on rigid spires that rarely require staking, making them architectural anchors for cottage gardens and cottage plantings. Their large, heart-shaped leaves with 3, 5, or 7 lobes and distinctly rough texture ground the plant visually, while showy flowers bloom sequentially from June to August, inviting pollinators to visit for weeks. These old-fashioned flowers tolerate a remarkable range of soil conditions, including areas where black walnut grows and where rabbits browse, and they establish self-sustaining colonies through prolific reseeding once established.
Hollyhocks serve as naturalized backdrop plants in cottage gardens and perennial borders, valued for their height and vertical emphasis rather than any culinary or edible purpose. Their tall spires work well in cutting gardens when fresh flowers are desired, and their propensity for self-seeding makes them ideal for gardeners who want to establish permanent, low-maintenance colonies that persist for years with minimal intervention. They naturalize effectively in informal plantings where their stature creates drama without the labor of staking or extensive deadheading.
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Sow hollyhock seeds directly in the garden in August or September for bloom the following year. Plant in well-drained soil in full sun and press seeds into the soil surface; they need light to germinate. Water gently and keep soil evenly moist until germination occurs.
Deadhead spent flowers to encourage the plant to act as a longer-lived perennial and extend bloom season. Alternatively, leave spent flower spikes in place after blooming ends to allow the plant to self-seed and establish new plants for future years. Remove individual dead or diseased leaves as they appear to improve appearance and air circulation, which helps prevent fungal diseases.
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“Hollyhocks carry the weight of centuries in their name and lineage. The genus name derives from the Latin Alcea, itself rooted in the Greek alkaia, referencing an ancient plant of the mallow family. Hollyhocks traveled through European gardens as beloved cottage staples, earning their place in seed catalogs and nursery lists where they remain unchanged, sometimes still listed under the older name Althaea. Their persistence in gardens across centuries stems not from careful breeding but from their own generosity: these plants seed themselves so readily that once introduced to a garden, they establish themselves as permanent residents, creating the illusion of long-term perennials even though individual plants live only a few years.”