In optimum conditions at least 70% of seeds will germinate. Approximately two weeks before the last frost date (or if hard frost is forecast) cut the plants back to 15cm (6″) tall, and mulch well with straw, soil, leaves, or burlap, to keep the roots from freezing. On the coast, with protective mulch, these plants may overwinter. Dig in lots of compost or rotted manure and add 1/2 to 1 cup of complete organic fertilizer per plant. Select a sunny, sheltered location with well-draining soil. Seeds can also be germinated between damp sheets of paper towel. Artichokes need a cool period (250 hours - approximately 10 to 11 days) below 10☌ (50☏) to induce flowering in the first year, but will not survive hard frost. The time needed for each Artichoke seed to germinate is indeed not uniform, because it. Transplant seedlings into the garden 2 weeks after the last average frost date for your area. Usually within 5 - 14 days Artichoke seed has sprouted (germinated). Keep moist in a warm place until seeds germinate in 10 to 21 days. Start indoors in late winter, four to six weeks before the last frost date. Zone: 6 (hardy in Zone 5 if you use mulch and cloche cover) Imperial Star grows beautifully in an open field situation. Plant seeds 1/4 inch deep in trays or pots filled with a moistened seed starting mix. Fertilize the container grown artichoke in midsummer with either commercial fertilizer or a top dressing of compost. Start seeds indoors, at least eight weeks before your average last frost date. Amend a good quality, well-draining potting mix with plenty of compost. Harvesting artichokes in the first year of growth is a real benefit for growers. To grow an artichoke in a container, select a pot that is at least 3 feet (1 m.) wide and a foot (31 cm.) deeper. Offshoots of these plants should be set out in the spring, so that the older plants can be replaced after a few years. Follow along with this handy How to Grow Artichokes from Seeds Guide and grow food. Before frost, cut back to 15cm (6″) tall and mulch with soil, straw, or leaves to keep the root from freezing. Artichokes require good soil, regular watering and feeding, plus frost protection in winter. ![]() Commercial culture is limited to warm areas in Zone 7 and above. It takes some work and a lot of patience to grow artichokes from seed, but it’s worth the effort.
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