After doing some experimentation myself I find that placing an air pruning container in/on a water source which is float valve controlled produces optimal results for many plants. Additionally, with proper companion planting you can plant far more densely than a traditional container. For example, plant nitrogen fixing veggies like green onions in a 3 to 1 ratio with nitrogen hungry plants like tomatoes. Place the entire system in a geothermal walipini and you have a year-round automated garden that will outperform twice the space in an open field at a marginal electric cost. You could also supplement light with Spectrum King LED lights. Add a way to shade (roll-up doors or garage doors) and you can shorten your grow cycles. Additionally, if you double-panel your poly cover and blow geothermal warm air between them it will reduce or eliminate snow loads which could be collected as water.
I highly recommend organic soil (i.e. self-produced compost and worm castings) when filling the container. Another tip, the container doesn't have to be a bag; it could be a big box with chicken wire and the below fabric.
RE: KALE FAIL: Root Ball Explosion (3" NFT Hydroponics)