Remove any doubt and get a soil test from your local Extension Office or get a test kit from Amazon. Do other plants grow well in that area? Is there something under the surface....an old foundation, septic tank, etc. I was digging behind a house we were renting and found a brick cistern about a foot down
. I like beds for lots of reasons. They work for me. Using those dimensions, you're going to need about 3.5 cubic yards of soil. That's a lot, maybe 25 full size wheel barrow loads. BUT that's a great size bed and should do really well. Don't use kiln dried or chemically treated lumber. If it was me, I'd use the cheapest masonry product to fit your budget. Really good soil, not mulch, will pay huge dividends.
https://static1.squarespace.com/stat.../KY_8%3A31.pdf

https://static1.squarespace.com/stat.../KY_8%3A31.pdf
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