Hollyhocks are classic garden plants, recognized for their towering, colorful flower spikes that add a striking vertical element to any landscape. While often grown from seed, planting them from roots offers a reliable method for gardeners seeking established growth.
Types of Hollyhock Roots for Planting
When acquiring hollyhocks, “roots” typically refer to dormant bare roots or small crowns. Bare roots appear as a cluster of fibrous roots, often with a visible growth point or bud. A crown is a more developed form, featuring a compact base with roots extending downwards and a central bud or cluster of undeveloped leaves emerging upwards. Planting roots offers faster establishment than seeds, as the plant already possesses a root system and stored energy. This method also ensures genetic consistency, important for propagating specific varieties.
Preparing for Planting
Successful hollyhock establishment begins with proper preparation. The optimal time to plant hollyhock roots is early spring, after the last frost, or in the fall, allowing roots to establish before winter. Hollyhocks thrive in full sun, requiring at least six to eight hours of direct sunlight daily. Good air circulation also helps reduce fungal disease risk. The ideal soil is well-draining and rich in organic matter, with a slightly acidic to neutral pH (6.0-7.0). For heavy clay, incorporate compost to improve drainage and aeration. For sandy soils, adding organic matter enhances water retention and nutrient availability. Before planting, soak bare roots in lukewarm water for a few hours to rehydrate them, but avoid soaking for more than 24 hours.
Step-by-Step Planting Guide
Dig a hole wide enough for the hollyhock roots and deep enough for the crown to sit at or slightly below the soil surface. The hole should be about 10-12 inches wide and 8-10 inches deep. Carefully place the hollyhock root into the hole, fanning out the roots evenly. Ensure the crown, the point where the stem meets the roots, is positioned correctly at the soil line.
Gently backfill the hole with prepared soil, ensuring no large air pockets remain. Lightly firm the soil around the base of the plant with your hands to ensure good contact between the roots and the soil. After backfilling, provide a thorough initial watering to settle the soil and eliminate any remaining air pockets. When planting multiple hollyhocks, space them 18 to 24 inches apart for mature growth and air circulation.
Initial Post-Planting Care
Consistent moisture is important for newly planted hollyhock roots during their establishment phase. Water regularly, particularly during dry periods, to keep the soil consistently moist but never waterlogged. Overwatering can lead to root rot, so ensure good drainage. Apply a 2 to 3-inch layer of organic mulch around the base to retain soil moisture, suppress weeds, and regulate soil temperature. Mulch also contributes organic matter to the soil as it decomposes over time.
While hollyhocks are robust, young plants may benefit from protection from extreme weather or pests. During their first growing season, newly planted hollyhocks typically focus on developing a strong root system and foliage. Many common biennial varieties produce a leafy rosette in the first year and flower profusely in their second year.