Least expensive raised garden beds??

[Ponderer]

Lumber is just crazy expensive. I have the DIY ability but my question is...what is the most economical way to make raised garden beds? Is 2x12 fir/hemlock acceptable or does it have to be cedar?

I will be building 4 boxes that are 4' x 4' each with a minimum depth desired of 12". These are going to be placed on top of an existing lawn area.

I made some boxes at a rental once that I did with cedar fence board and lined them with plastic on the sides to lessen the contact of soil to lumber. I knew I would not be at this location for a long time so I was not as worried about longevity. I am considering that style again even thought I am now the homeowner because the 2x12 stock, or even 2x6 for that matter is just so expensive.

I want a garden so very much. What is the most economical way to do this??

[Ceashels]

I am using cinder blocks for my back 4x4 square foot garden beds. They are 8 inches high though and I haven't made them permanent so no mortar until I know for sure they are where I want them to be.

If you have the masonry skills you might want to price it out. You can always add a decorative cover to the sides in the future.

[Ponderer]

Thank you for the reply. I actually located a really good article after I posted and it helped my decision making process. I went with untreated fir/hemlock in a 2x12 width and height. I did this fully knowing I will need to replace them in 4-6 years. This article broke down this lumber versus cedar and man made plastic materials. It basically comes down to labor versus materials and I chose to invest more in the labor by having to re-do sooner.

I am now the proud owner of enough lumber, including the 2x4 interior corner blocks and 3" treated screws to do all 4 boxes for under $75. I also got all the cuts done at Home Depot and the guy only charged me $1.50 for the cutting fee.

I am happy.