I looked for old burlap bags, but could not seem to find any locally, and the ones to order online were not cost effective for me. So, I bought the cheapest burlap at Joann’s, and used a 40% off coupon to make it nearly $2 a yard. Then:
1. Cut the yards into twenty inch pieces, so they are 20 inch by 48 inch
2. Sew up the side to form a tube.
You could stop there, however even though I wanted an open bottom ‘bag’, I also wanted the dirt to be able to hold the bag in place, so sewed only the bottom corners of the bag, about three inches in on each side.
Also, I like the rolled down look at the top of the bag, but was having a hard time keeping the top of new burlap rolled, so I tacked it down in all four ‘corners’ of the bag.
So, while crude but effective, this was the neat result!