Will regular potting soil mixed with perlite work?
We use a soil less mix that we make ourselves. 6 parts peat moss 2 parts aged cow poop 1/2 part perlite or vermiculite small dash of blood meal or other nitrogen rich fertilizer We mix this by the cubic yard with a cement mixer and a bobcat, but for small quantities I would suggest using a small scoop and mixing in a five gallon bucket.Make sure you mix well. You can find aged cow maure in bags at most home supply stores. We also use this for all of our house plants. Regular potting soil is usually too heavy, even when mixed with perlite, for tiny roots to push through and spread properly, and there is no advantage at all to using potting soil. There is much more nutrient in this mix.
