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When To Plant Hollyhock Seeds. You can plant hollyhock seeds in the later months of summer to enjoy blooms the following summer. Providing tall spikes of large summer blooms hollyhocks Alcea rosea grow best from seed sown outdoors in their final growing sites. Plant the hollyhocks outdoors in the spring. What is the best time to plant hollyhock seeds.
Spring and fall are the best times to start the wonderful hollyhock Alcea rosea from seed. Plant the hollyhocks outdoors in the spring. Choose a pot at least 400mm wide and deep. These will grow into flowering plants the following season. You can also plant bare root hollyhocks. Dont plant hollyhocks again in the same beds where they have been infected with rust in the past.
Water gently and keep moist through germination period.
The seeds are large enough to space evenly on the compost surface. This growing and maintenance guide will cover the following topics for this biennial. Hollyhocks will be ready for planting out in the garden by June but wont flower well until the following year. Spring and fall are the best times to start the wonderful hollyhock Alcea rosea from seed. Hollyhock plants can be pruned when it fades out. You can plant hollyhock seeds in the later months of summer to enjoy blooms the following summer.