Last spring I found this trunk on the side of the road. I grabbed it not really sure how I would use it. One side was rotted out, and several spiders had taken up residence. It was simply a shelf for potted plants for a year, but this spring I decided to give it a new life as a salad bar.
The first thing I did was to remove the lid and wipe down the trunk with white vinegar to get rid of some mildew. Secondly I used wood cut from the lid in order to stabilize the corner that had suffered from rot. After that I drilled holes in the bottom for extra drainage and lined the trunk with black landscape fabric. I used my staple gun to attach it a little below the top of the trunk.
I filled it with soil and mixed in some seed-starting mix. Potting soil is already a combination, so that would have worked as well. I just used what I had on hand. Garden soil itself will compact too quickly in a container. After that I dug up some volunteer lettuces that had come up in a bed where I let last year's lettuce bolt (produce seed). I transplanted several into one half of the trunk. In the other side I sowed Spinach and Black Simpson Lettuce seeds.
In a few weeks I should have plenty of greens right outside of my door. I will continue to sow seeds as I pick plants so that I will have greens all spring, summer, and fall.