Arizona's Best Tomato & Vegetable Food with an N, P and K of 8-10-3 contains the necessary nutrients to aid in the development of plant growth and crop yield for healthier, bigger and more flavorful vegetables. Most vegetables are classified as either “cool season” or “warm season” crops. Your cool season crops are generally the “leafy-type” vegetables. Including lettuce, broccoli, cabbage, cauliflower, etc. As a general rule of thumb, vegetables should be fertilized every three to four weeks during their growing season. It is preferred to use lighter but more frequent applications for better yields and higher quality.