Hi Allen, They’re 4×4’s we cemented in and then used inexpensive fence pickets as the cross pieces. Then we added some IKEA containers to use as planters on the wall, and we also use the pickets to help trellis veggies. There’s a full post about the beds here: https://www.polishedhabitat.com/building-raised-garden-bed/

Hi Theda, thank you so much! Here’s the post that shows how we created the raised bed. There are spots for veggies in the bed and then herbs and flowers on the backing! https://www.polishedhabitat.com/building-raised-garden-bed/