Hi there!!! Is it a good idea to use ordinary dirt from the garden and mix it with some potting soil? I want to use some 5 gallon buckets for my habaneros to grow in, but its a bit expensive to fill all the way to the top with just potting soil, I need like 6 buckets. I also have an 11 inch diameter by 9 inch deep pot, do you guys think its deep enough for a buth jolokia pepper to grow in???? Thank you