Bac Ha district in Lao Cai is leveraging its high mountainous terrain and cool climate to cultivate temperate vegetables and tubers, focusing on rainbow cabbage, carrots, celery, and other off-season crops. The district has allocated about 170 hectares for off-season vegetable farming in highland communes, employing organic farming practices and a strategy of overlapping seasons for consistent harvest. The goal is to supply these vegetables to large supermarkets in Hanoi, with a selling price of 20,000 VND/kg, resulting in an average income of 200 million VND/hectare for the farmers, thereby enhancing agricultural efficiency and income.