You can also pull the weed up by the roots just before the New moon, the water level is farther from the earth then, and weeds will not come back until the full moon, and most likely by then they won't either... I plowed my garden this year just before the new moon at the darkest time, and even though we have had plenty of rain this year, I have had virtually no weeds. People think that I have sprayed for weeds, my garden is so clean.. I till at the New moon each month, and that is all I have to till..