How to grow hollyhocks. Some gardeners plant seeds or plants two years in a row to have flowers every season. Seeds can be sown directly outdoors about a week before last frost. You can also plant bare root hollyhocks. Providing tall spikes of large summer blooms, hollyhocks (Alcea rosea) grow best from seed sown outdoors in their final growing sites. Wait for the seed pods to dry. The ideal spot for growing on has maximum all-round light – ideally, plants should have warm roots but cool tops. 8. You might get the odd plant … 1. 9. Hollyhocks are easy to grow and their blooms come in a wide range of jewel colours, flowering from early summer to autumn. Prepare some humus rich well dug growing medium for trays. Their tall spires look good grown against walls and fences and are stalwarts of cottage gardens. Select a planting site with full sun exposure. How to grow hollyhocks in your garden. Hardy in U.S. Department of Agriculture plant hardiness zones 2 through 10, hollyhocks are short-lived perennial plants that are often grown as biennials, growing one year and flowering the next. They are a great seed company to order from - both in germination and service. HOLLYHOCK FOLIAGE: Hairy leaves, 6-8" across, borne in low clumps. Break apart the pods, separate the seeds and plant in a well prepared garden area. Similar conditions in the ground. Hollyhock flowers are easy to grow for beginner gardeners! You can plant them in seedling trays, or directly into the garden. It’s tradition to let hollyhocks self-seed and grow in clusters but spacing the plants a few feet apart can also greatly reduce the spread of rust. Hollyhocks (Alcea rosea) are flowering plants that mock the growth of a perennial plant because they are known for their ability to self seed. Sow at just ¼ inch deep and about 2 feet apart. 10. I find the plants make this happen on their own. If not, look into it. Hollyhock seeds only need to be planted right below the soil, no more than 1/4-inch (.6 cm.) I wintersowed my first hollyhocks last winter and have had blooms for the past 3-4 weeks. The seeds are fairly large, plant them about 3cm apart in pots. You can grow Hollyhocks (some spell it Holly hocks) in your Cottage Garden one easy step at a time. SOIL: Hollyhock will do well in almost any soil but prefers a well-drained soil with pH 6.0 - 8.0, from slightly acid to alkaline. Are you familliar with the wintersowing method? A pollinator host plant and beautiful flower that adds height and beauty to any garden. Hollyhock plants should be about 2 feet (.6 m.) apart to grow well. How and when to plant hollyhock seeds: Hollyhocks are easily started from seed indoors or out. Hollyhocks will be ready for planting out in the garden by June, but won't flower well until the following year. They have a wide variety of various hollyhock seeds including more than one dwarf kinds. 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