The cannabis cultivated by Khun Jen Jen and his family around Wang Yang district is a classic Lao-Isan (Mekong) landrace population, characterised by a tall, elegant ‘sativa’ like morphology, long internodal spacing and high resin production. These plants can easily reach 3 meters in height, thriving in the warm, dry climate of the Phu Phan Mountains.
 
Two primary expressions are present in the population: Tiger Tail and Squirrel Tail. 

Historically, the Wang Yang region's strategic location along the Mekong River facilitated cross-border trade with Laos, where similar Lao-Isan landraces were grown. This exchange enriched the genetic diversity of the local landrace and the talent of local growers who elevated the Cannabis in the area into one of the most sought-after Thai sativas in the world.

However, during the Cold War, political changes and international pressure led to the criminalization of cannabis in Thailand, pushing cultivation into the shadows. Many traditional farmers abandoned their fields, leading to a severe genetic bottleneck across the population and wider region. In recent years, the introgression of foreign genetics from modern hybrids has further diluted the purity of the ancient landrace.