When sourcing garlic in bulk, quality is categorized by bulb diameter (e.g., 4.5cm, 5.0cm, 5.5cm, and 6.0cm+) and variety, such as Normal White Garlic (red skin) or Pure White Garlic (snow white). Buyers should ensure the bulbs are firm to the touch, plump, and free from sprouts or mechanical damage. High-quality garlic must have a tight outer skin and no signs of mold, black heart, or insect infestation. For long-term storage, the moisture content should be strictly controlled to prevent weight loss or decay during transit.