Answer: It depends on your soil fertility. If your garden is fairly new and you haven't had time to build up a rich organic soil, fertilizing would be more frequent. You can also let your plants be a guide. If bottom leaves start to yellow, the plant probably needs nitrogen. As a guideline, you can fertilize tomatoes every two to four weeks. As for the procedure, it depends on what type of fertilizer you buy. All fertilizer products must provide instructions on their use on the packaging. If you use a granular fertilizer, water well before and after applying to help prevent burn. Scratch it into the soil several inches away from the stem of the plant.
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