|Organic Imperial Star Artichoke seeds require the shortest period of vernalization and will produce in the first season. Needs about 500 hours below 50°F. Plant is rounded, nearly spineless and the bud- size 3-4" with 6-8 mature buds per plant. Can be treated as a perennial to zone 6, other than grown as an annual. 250 hours is about 10.5 days, better if 35 days. 80-90 days to harvest. Grown Organically. 20 seeds per pkg.|
Vegetable Garden - Tips on Growing Artichoke From Seeds
The objective is to convince the Artichoke plant that it is two years old and ready to make buds, rather than a seedling ready to make only leaves. This is done by growing the plant at cool temperatures for a prescribed length of time. This cold treatment makes the seedling behave as if it is an older plant ready to flower.
Before you use the cold treatment here is information for sowing the seed.
Sowing the Artichoke Seeds
Sow outdoors: Not recommended.
Growing Artichoke Seeds:
Temperatures during the cold treatment should remain below 50° F (10° C) but above 35°F (2° C) for at least 250 continuous hours (about 10½ days). Since it is difficult to prevent times when temperatures rise above 50° F (10° C) give the plant the cold treatment for an even longer period, let's say from four to six weeks.
Put the plants in a cold frame about six weeks before the last frost based on your location and zone. When all danger of frost is past and the soil temperature is above 60ºF (16ºC) set plants about 2 feet apart in the bed.
USDA Hardiness Zone -First Frost Date- Last Frost Date