Q.Looking To Plant Blueberries In Container That Won’t Poison Me.
I’m curious about plastic garbage cans. They are nice and big and I can put holes to drain them. They are some form of plastic. Is this a good idea? I had just built some retaining walls with railroad ties and found that planting in there is not a good idea. I would dig the garbage cans into the ground but they would have holes at the bottom that the roots can get out and they would be near the railroad ties or I could keep them out of the ground. What do you think?

Certified GKH Gardening Expert
Most of the plastics that are common, now, are PET or other materials that are considered safe (non-leaching).
As long as you use soil, and fertilizers that are meant for blueberries, I would say that you will be best growing them in the cans. You will still need drainage holes to allow any extra water to leave the container.
Here is an article that will help you to grow blueberries in container:
https://www.gardeningknowhow.com/edible/fruits/blueberries/grow-blueberries-in-pots.htm