The USDA offers a plant hardiness zone map, where the United States is divided into separate areas, based on annual average winter temperatures, divided into 10 degree Fahrenheit zones. Essentially, it provides a guide for gardeners for which plants, and varieties of those plants, can be grown in their zone. The site offers a search function, allowing one to search for their zone by entering their zip code. These zones are imprinted on seed packets, allowing new gardeners and experienced gardeners trying a new variety, the chance to grow their own food, free of chemicals and harmful bacteria.
There are at least 48 varieties of tomatoes grown within different areas of the United States. On The Tasteful Garden, one can purchase seeds for varying amounts for each variety. From the "better boy" tomato to the "watermelon beefsteak" tomato. My personal favorite is the cherry tomato, because they are a great alternative to eating something like whoppers or potato chips. In fact, tomatoes are a good source of Vitamins A, B6, C, E, K and other nutrients, such as biotin, manganese, copper, potassium, folate, niacin & phosphorous.
Tomato plants require 3 primary nutrients, Phosphorous, nitrogen and potassium. They also require secondary nutrients, in lesser amounts, to germinate, grow and thrive, including calcium, magnesium and sulfur. In addition, micro nutrients are required, including zinc, iron, boride, molybdenum, copper, chloride and manganese. When these plants receive enough sunlight, water and these nutrients, they will endure stress and produce large and juicy fruit.