This fencing piece had been sitting in our garage since we moved in 7 years ago and I finally put it to good use:
2. Assemble box with 2×2 legs (cut at 22″).
Then add top 1×2 trim mitered to cover the exposed edges:
3. I used the back fence support pieces as my bottom rails, here they are set 8″ down for the mum pots but only screwed in and NO glue:
In the future if I need to adjust the depth for a different pot I can move the rails without a problem.
4. The raw 1×2 and 2×2 boards are finished using a vinegar/steel wool mixture which ages the wood instantaneously, BE CAREFUL to avoid getting the mixture on the fence and pallet pieces.