Disclaimer: This post was originally posted by Newbie, csleung. This was originally posted June 4, 2009.
I always add a shovelful of homemade compost each year as well as greensand (for tomatoes), bone meal, dolomite, ground granite, and chelated iron. I'm on my 5th year of using the same soil mix. My earthboxes are now full of earthworms (from the homemade compost)--I think they like it in there--they take care of getting rid of old roots and leaves for me. Supposedly I think the 5 years is the max for using the original soil mix, but my veggies are still producing so well that I'm wondering if I can keep on going before dumping for a few years...As far as wicking goes, I've never had an issue with that...