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ANy rule of thumb for how much you should water your vegtables from the time you put your seed in the ground to when you harvest.
It depends on the veg you are growing, there's usally advice on the seed packets. Toms need plenty of water and should never dry out. As long as you keep everything moist without being water logged you should be ok.
I am growing mostly lettuce,beets,green onions ,stings beans, spinach,carrots,potatoes and strawberries.