Maryl said:You don't really want big chunks of pine bark, just what they call the "fines" - the littler pieces. As I said I have a wire screen (around 1/4 inch holes) that I run a bag of bark mulch over to let the fines fall through. Some good nurseries may carry the "fines". Combine the bark fines with builders sand, compost, and acquarium gravel (the sharp edged kind - not the round pebbly kind. It comes in colors and I favor blue just so that I can see how much I've added) and perlite. Since you are going to over winter yours in pots it's crucial that the mix drain well. Squeeze a hand full of the prepared mix and if it clumps up too much add some more rough material........Good luck with your move.........Maryl