Citrus trees in Hop Thinh commune has been growing for the past 3 years. Starting from small households, it has now expanded to the whole commune with a total area of nearly 40 hectares. Particularly in 2018, the commune expanded the citrus growing area with a concentrated scale of 10 hectares, including different kinds of Canh oranges, V2 orange, oranges with yellow heart, Dien pomelos, green pomelos complied with VietGAP process, directing to the trade mark of the clean agricultural products with high quality. In 2018, some households also have harvested oranges with stable prices, bringing high economic efficiency, which is many times higher than other traditional crops.

Hai Cao and Gieng are two strong citrus tree growing villages with the area of 25 hectares.  There are 24 households participating in citrus tree growing. The households who grow less has 2,000 - 3,000 m2, and those who grow more has 5 - 6 hectares. At the end of 2018, many orange and grapefruit orchards were harvested, bringing the revenue of hundreds of millions VND to the growers. Many households have boldly gone off and got ahead of the technology, after renovating the land, built a model of citrus planting according to VietGAP standards, thanks to the experienced households from famous orange growing areas such as Cao Phong and Lac Thuy to get the technical support. As a result, the harvested products with high quality and productivity are favored in the market.

Mr. Nguyen Van Quynh has the largest orange and pomelo garden in Gieng village with the area of 5.5 hectares. In 2015, he boldly borrowed money, renovated the mixed gardens, invested in seedlings, the sprinkler systems, built a model of citrus planting according to VietGAP standards. Mr. Quynh said: "In 2018 my family earned 80 million VND from selling Canh oranges.