You would need to be careful about the material you chose. I have a wooden mail box and it looked lovely when it first got put in, but now looks horrible due to sun damage. Metal might be best option, so long as it doesn’t rust. Also, you will need to be careful on placement. I tried one using the plastic wall pots from Bunnings, but the side of my house doesn’t get enough sun and all the plants died.

There are some very interesting answers below and hopefully the MoM’s member asking the question has found them very useful. I have found the answers useful and this is now something of great interest for me. I am always happy to read about garden ideas and ways of making our garden both practical and pretty.

You could consider combining both — a wooden frame with metal planters, for example — to get the best of both worlds. Wooden vertical gardens. Offer good insulation for plant roots. However, wood can degrade over time, especially with moisture exposure, so using treated timber or sealing it properly is important to extend its life. Metal vertical gardens, on the other hand, are sleek, modern, and incredibly durable. They’re resistant to rot, pests, and weather damage, making them a great low-maintenance option. Some gardeners find that metal heats up quickly in the sun, which can affect root temperature, so placement and insulation might need consideration.

Personally I would use metal above wood as will on a certain point rot and fall apart. A vertical vegetable garden looks very nice indeed, but do realize that in general plants don’t do as well in pots compare to planted in the soil. Only a limited amount of plants/vegetables are suitable to grow in pots and they do needs more care; you will need to water, fertilize and prune more often

I would be more inclined to pick metal. We previously lived in a home that had wooden palettes drilled into the fence for a vertical garden. The issue was the water would make the wood swell then fall apart at the joints. Another issue was the ants taking over, it became hard repotting and taking care of pests when the wood was so flimsy

I do not have a vertical vegetable garden but this is a very interesting question for this community, and hopefully this question will receive some super interesting answers from the community too. I would actually like to do this in my garden too and make the best use of all possible spaces in the garden.