Pallets can be a cheap and easy way to create a vertical garden, but there are some things you should keep in mind when selecting one for use.
Pallets are used to transport a variety of goods across the world and are treated with either heat or methyl bromide to keep fungi and diseases from spreading with the wood.
Pallets created in the last few years for shipping overseas are required to have a marking that indicates which method was used to treat them.
Select a pallet that is heat-treated, as it is the safer of the two. Pallets that have been heat-treated will be marked with HT on their surface, usually burned or stamped onto the wood.