How often you water your vegetable garden will depend on a number of factors, soil type, weather conditions, and type of vegetable plant. If the weather is hot and dry and the soil is fast draining then watering every day is a good idea. I generally suggest you look at the soil, poke your finger into the soil if it's dry then give the vegetable plant a good water. Do this every day and if it's constantly dry keep watering daily or even twice daily.