I purchased metal raised beds because plastic is dead in a summer or two. I can use the garden soil in the beds so that’s not a total loss, just need some amendments.
I used to make wooden raised beds out of landscaping timber, but as I got older, I wanted higher walls on the raised beds. Buying lumber a few years ago with the COVID-19 pandemic was prohibitive. I think a 2X4 stud was something like $5,000.00 per board! Exaggeration, of course, but the lumber prices went through the roof for a few years.
During that time, I made some 16-inch-high raised beds using wood frames and galvanized metal panels. That saved a lot of money. I used salvaged lumber and bought the metal panels. Total cost per 4X4 bed was about $50.00 compared to the price of an all wood raised bed, at that time, around $200.00.
Picture of raised bed using galvanized metal panels....
Last year I got into making stuff out of free pallet wood. Now I have built 4 pallet wood raised beds and all I had to buy was the screws and nails for the project.
Picture of free pallet wood raised bed...
I don't know how long the pallet wood raised beds will last, but certainly longer than plastic sitting out in the sun, and not as long as metal which will last for many years. I expect to get 5 years or more from the pallet wood beds, at which time, I will either replace any rotted wood or just build a new raised bed. After all, the cost is basically free.
Personally, I like the all-pallet wood raised beds better because they are all wood. But the galvanized metal panel raised beds are nice too and saved me a lot of money at the time. Since I started getting into pallet wood projects, almost all my gardening builds are made out of pallet wood.
For comparison, both types of raised beds are 16 inches high and 4X4 feet square. I fill the bottom 8-10 inches with hügelkultur wood and the top 6-8 inches with a mix of topsoil and chicken run compost mixed 1:1 for the growing medium. I have had excellent results in growing food.