Garlic is a staple ingredient in many cuisines around the world, known for its pungent flavor and numerous health benefits. While garlic is grown in many countries, it is a commonly held belief that all garlic sold in supermarkets and grocery store. 

First, it is important to note that not all garlic sold comes from China. However, China is the world's largest producer and exporter of garlic, accounting for over 80% of global production. China's garlic industry has grown rapidly in recent decades, driven by favorable growing conditions, low labor costs, and government policies that promote agricultural exports. As a result, China has become the dominant player in the global garlic market, exporting millions of tons of garlic each year to countries around the world.

One factor that contributes to China's dominance in the garlic market is the country's favorable growing conditions. Garlic requires well-drained soil and a cool climate, which are abundant in many parts of China. The country's vast land area and diverse climate zones also provide a wide range of growing environments for garlic, allowing for year-round production in different regions.

Another factor is China's lower labor costs. In China, garlic is often grown by small-scale farmers who rely on family labor rather than hired workers. This keeps production costs low and allows Chinese garlic to be sold at lower prices than garlic grown in other countries.

Finally, China's government has implemented policies to support the country's agricultural exports, including garlic. These policies include subsidies for garlic farmers, export tax rebates, and investment in infrastructure for agricultural production and export.