Artichokes starts that are set out in the garden in late spring will offer buds that are ready to be harvested in mid-summer.
Look for buds that are full, with leaves that are still compact and tight against the bud.
Squeeze the artichoke lightly. It should give a little squeak if it is ready.
Cut the artichoke stem with the garden shears about 3 inches away from the base of the artichoke bud.