I have about two garbage cans (plastic) full of dirt that I dug up when I added a vegetable garden spring 2009. I poured boiling water over the dirt to hopefully kill any weeds and grass seeds that would definitely have sprouted. I know because last spring, after I rototilled the garden area (originally a lawn), within a couple of weeks, new grass and weeds were quickly growing back and thanks to lots of rain, that area was almost the same as the rest of the lawn. I then pulled up the grass and weeds, leaving the dirt underneath and the same thing happened, new grass and weeds. I then shoveled the dirt into the garbage cans, added the boiling water, then left the dirt and water overnight, poured off the water the next day. I now have about 200 iris rhizomes left to plant and would like to use this dirt, however, do I need to add any nutrients to the dirt before using it.

Thanks. Jane