Mix for Hosta - large volume
I'm looking for ideas for what to use for growing Hosta in containers. I need to have something that will stay in the containers without having to put a screen in the pot.
I want to keep it some what inexpensive, but even more importantly, for the volume I need it is too time consuming to have to screen materials. Couple hundred 1 gallon+ pots.
Do you think something like a 70-80% pine bark mulch with the rest peat might work?
What is in commercial soils like miracle grow that give it structure so it does easily wash out of drain holes? Is that just the peat?