When selecting artichokes, look for those that are compact, firm and heavy for their size. The shape can be round or conical. Tightly packed leaves and an even green color indicate freshness. To pick the best, look for tiny thorns or receded thorns at the tip of each of the leaves. Thornless globe artichokes have small hearts and therefore less for you to enjoy and tend to be tougher when cooked.
All artichokes are mature when picked.
The babies are mature, too. They grow further down the stem, tucked in the shade under the big leaves of the plant. The babies, after trimming, are entirely edible. Baby artichokes are sold loose or in plastic bags or trays. May. Artichoke hearts are available canned or frozen, with or without a marinade.