Of course they will grow, it is what they are programmed to do! Don't doubt yourself!! ;D I won't be watering mine for a while yet, my lovely light top soil is on a bed of orange clay, so altho the top couple of inches are quite dry, down deep is still lovely and wet. If we have a long warm dry spell then water, but with all the April showers we are having, I should think you can leave them to their own devices for the time being.