No soil worth a shit is $4.00. Sorry. Turn your oven on to 350 degrees. Open your windows. Put your soil in the oven spread evenly on cookie sheets or in a big casserole. Place in the oven. Go for a walk. Internal temps need to reach a sustained 165 F temp for an hour. Higher is fine. This kills everything. Period. Nematodes, beneficial bacteria, grubs, plant viruses etc. Now mix with perlite or vermiculite or even saw dust from NON-TREATED wood for drainage. Then get a job and buy your good soil after growing these out.