Technical Abstract: Garlic (Allium sativum L.) bulbs are marketed for their health and culinary values. It is difficult to identify garlic cultivars or classes grown under diverse conditions as a result of their highly elastic environmental responses, particularly relating to skin color and clove arrangement of bulbs. Ten diverse garlic cultivars were grown at twelve locations throughout the United States and Canada as part of a project to identify traits that are phenotypically stable regardless of growth location. The phenotypic traits of scape production (hardneck or softneck), clove arrangement, number of bulbils, bulbil size, bulbil color, number of cloves, clove weight, clove skin color, and clove skin tightness were generally stable for each cultivar regardless of production location and conditions. Total phenolics were assayed for the 10 cultivars grown at each location. Cultivars Purple glazer, Siberian, Chesnok red, and Spanish roja had relatively high levels of total phenolics (0.46-0.60 mg gallic acid equivalents/g fresh weight (FW) compared to the overall range (0.31-0.60 mg gallic acid equivalents/g FW). These results provide information to garlic collection managers and producers to assist in cultivar identification, selection, and description efforts for specific health and culinary values.