Bangkok — Thai households can now grow six pots of cannabis each to supplement their income, the nation’s health minister said, as the first country in the region to legalise medical marijuana further eased rules to promote the crop’s commercial use.

Families may form communities to grow marijuana and supply the crop to public hospitals and state facilities, or use them to make food and cosmetic products as a fresh revenue source, Thailand’s deputy premier and health minister Anutin Charnvirakul said in a statement Friday...