Hard neck garlic varieties produce a central stalk which grows straight up and forms one or two loops. The garlic top is called a scape and contains a bulge where bulbils form. If you want all the plant's energy to go into producing a large bulb, snip the scape off after it has formed one loop. If you want to use the bulbils to propagate more garlic, leave them in place until harvest time and dry them separately from the bulbs.
As you We harvest the garlic scapes and use them in stir fries and pesto, as a pizza topping, or pickle them for a tasty appetizer. They are a true delicacy.
As stated by Garlic Farm, garlic requires fairly even soil moisture during the growing season with no additional moisture during the last three weeks. Adding mulch is one way to maintain even moisture in the soil. Not enough moisture results in an insufficient sized bulb. Over watering results in garlic that does not cure or store well. As you harvest your scapes, leave a couple on each bed - when they stand up straight, that is a sign that it is time to stop watering.
In the meantime, feast well!