spent bag soil
I have always used bagged soil (usually the all-purpose Miracle Grow type). Every spring I start a new herb garden in my kitchen window, which means cleaning the spent soil from last year's herb garden out of the pots. Up until two years ago, I had an outdoor bed I could just mix the spent soil up in. Now that I live in an apartment, I don't have that, though, so I trash the dead roots and empty the soil into a bag. It's too dry to reuse, and last fall I thought I could just add some water and fertilizer and grow other houseplants in it, but I found out that's totally wrong (for some reason, the roots all got super waterlogged). How can I re-purpose this soil?