I will be planting about 80 seedlings (Norway Spruce and American Plum) and was curious how much soil moist I should buy and how much to put in each hole? Thanks.
I'm not sure how much it really helps. I've tried WaterKeep. It may have more value in a more arid climate than mine. I put a capful in a 5 gal bucket and then added water to make a slurry. I dipped the roots of bare root seedlings in it before plant it. Any left over slurry I just dumped into the holes.