I just put up 2 tunnel 40 x 200 greenhouses wondering if I need to buy top soil or if it will work in ground tilled up - people from Ontario have any suggestions ?
You just set up two commercial size greenhouses to grow cannabis and you dont know what it can grow in? Obviously it would depend on the quality of the soil in that area.
I know all about it just trying to figure out least expensive way -- it's good soil but clay a foot down so I'm thinking of getting 5 dump truck of top soil and building sand boxes 4x4 for roots --
You'll always have better luck adding soil that you know for a fact is of good quality, especially if the clay is only a foot down. I'd strongly suggest adding your own soil