Solo garlic
Solo garlic, also known as single clove garlic, monobulb garlic, single bulb garlic, or pearl garlic, is a type of Allium sativum (garlic). The size of the single clove differs from approximately 25 to 50 mm in diameter. It has the flavour of the garlic clove but is somewhat milder and slightly perfumed. The appearance is akin to that of a pickling onion, with white skin and often purple stripes. Compared to traditional garlic, Solo garlic offers the advantage of being easy to peel quickly. Single clove garlic originated in the mountainous Yunnan province of southwestern China. It is not a single variety of garlic, but rather a product of specific planting practices. As a result, single cloved versions of other garlic species such as Allium nigrum and Allium ampeloprasum are also available. Growth
Small bulbs of solo garlic can be obtained by planting the bulbils of any variety of garlic. However, commercial production comes from areas where garlic is likely to produce a solo bulb due to environmental factors. The climate in these areas, combined with careful cultivation, leads to a large percentage of the garlic crop failing to split into multiple cloves. Cultivation 

Solo garlic is believed to have originated in Yunnan, China, a mountainous area. The product is known as  "only-child garlic". See also 
Black garlic (food)

References 

Spices
Garlic