The past couple of years I've grown Imperial Star artichokes, some from seed, some from roots overwintered in pots under the house. This year, I seeded the Imperial Stars, plus some Green Globe artichokes. The Imperial Stars which were overwintered for their second year fared poorly; fewer leaves, a much smaller plant, and a few small chokes. The Imperial Stars which I seeded this season did fine, but the stars of the garden were the Green Globes which I started from seed this year. Big plants, big artichokes, nice smaller side chokes, too. I'll try overwintering a few of the Green Globes, but won't bother with Imperial Star again.