A green artichoke specifically bred for annual production, Imperial Star will produce well-developed artichokes the first year from seed. Plants become 1 1/2-3' tall and have an open growth habit. Each typically produces 1-2 primary buds, which average 3-4" in diameter, and 5-7 smaller secondary buds. Perennial in Zone 7 and warmer; otherwise treat as an annual. Avg. 10,000 seeds/lb. Packet: 25 seeds.
CULTURE: Artichokes require very fertile, well-drained soils in a pH range of 6.5–8.0. Sow artichokes indoors 8–12 weeks before last spring frost date. Sow 2-3 seeds per cell in plug trays or individual containers ¼" deep. Germinate at 70–80°F (21–26°C). As soon as seedlings can be handled, transplant to 4" pots or 72-cell plug flats, if necessary, and grow at 60–70°F (15–21°C) during the day and 50–60°F (10-15°C) at night. Transplant 6- to 12-week-old plants to the field 2–3' apart in rows 4–6' apart. Perennial to Zones 7 and warmer, otherwise, treat as an annual. MILD AREAS: Where winter low is above 14°F (-10°C), sow seeds in fall, harvest in spring. IMPORTANT COLD TREATMENT (VERNALIZATION): Time transplanting so plants receive 10 days of 45–50°F (7.2–10°C) temperatures to induce earlier budding. Protect from frost. HARVEST: Clip mature buds midsummer to midfall, depending on location. SEED SPECS: SEEDS/LB.: Avg. 9,650. PACKET: 25 seeds unless otherwise noted.