ARTICHOKE SEEDS~GREEN GLOBE~HEIRLOOM~30 SEEDS THE 3-6 FT. PLANTS OF THIS PERENNIAL PRODUCE 3-4 INCH EDIBLE TENDER FLOWER HEADS IN 18 MONTHS. PLANTING DEPTH: 1/4-1/2" SEED SPACING: 3-4" ROW SPACING: 36-48" GERMINATION TEMPERATURE: 70-80 DEGREES GERMINATION TIME IN DAYS: 10-21 AVERAGE PLANTING DATES: 3/15-8/15 NUMBER OF SEEDS PER FOO ROW: 3 SPACING AFTER THINNING: 24-36" DAYS TO MATURITY: UP TO 180