Severe cold weather and poor growth have led to a significant increase in the prices of vegetables such as sesame leaves, lettuce, and green peppers in South Korea. Green lettuce prices have surged by over 90%, and green pepper prices have doubled due to cold damage and poor growth. Other vegetables like red lettuce, perilla leaves, and green and red bell peppers have also seen price hikes. The situation is expected to persist until the end of February, making it the most expensive period for vegetables in terms of pricing.