best to test it in a lab. easier to add soil amendments, like peat, perlite and too many other things i won't go into. cannabis likes moist, fertile, well drained soil. is your soil dark? does it stick together in a clump when you sqeeze it into a ball or does it crumble in your hand? is it red? (iron) if you are bringing it inside amend it to be safe. it's probably not porous enough. unless you're lucky enough to have an old leaf pile to draw from or alot of composted manure. you make the newbie mistake of thinking soil is DIRT. it isn't. it is diverse, alive, fertile and teaming with life and the minerals/elements cannabis needs for photosynthesis and making leaves, stems and the best part flowers.