1. Mustard is one of the most popular and widely grown green leafy vegetables in Nepal, grown from lowland to high hills. 2. It grows best in cool weather with moderate temperatures and humidity. Different varieties are grown from January to June in the hills and February to March in the plains. 3. Common recommended varieties include Khumal Broad Leaf, Marpha Broad Leaf, Khumal Red Leaf, Tankhuwa, Red Giant, and Mike Purple Giant.