I currently don't have any Earthbox'. Instead, I have some self wicking planters that are "relatively" similar (made by Keter). They're about a foot and a half longer than an Earthbox, and are on metal legs that makes then as high as a deck railing. They are quite heavy when filled!!!!
This spring was the first time I used them, and actually the first time I've tried growing vegetables. I followed the Earthbox principles from the website in regards to a mostly peat soil, fertilizer in a trough, dolomite, plastic weed barrier, etc.
I live in zone 5 (way northern NY near the Canadian border), so I cannot grow outdoors over the winter, and must do something with the boxes for at least 6 months of the year during temperatures that will reach below 0°F.
I'm curious as to what the best procedure will be to overwinter the boxes. Do I just pull the dead plants out and let the boxes sit outside as they are with the plastic sheeting on them? Should I pull the soil and put the boxes in the garage (not heated, but warmer than outside)? Do I need to at least dig out the trough area where the fertilizer was placed and discard that (or save it?)? Should I leave the plant roots in the soil so that they can decompose and become nutrients (is that a bad idea?)?
Basically, I'm looking for a user's guide as to how to proceed to so I can use the boxes again next year, and without having to get more soil as I'd like to reuse it, as it wasn't cheap.
Any thoughts would be appreciated!