Those are very nice! I would love to replace three of my wooden beds with them. So far I have been using cinder blocks - I can move one at a time and build gradually. But those cement ones are much nicer looking. The cinder blocks tend to settle and become uneven with time. I like that I can buil dthe bed a little taller, for easier maintenance for me. But that could be done with those nice cement panels too.
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My thinking exactly! I wonder how tall you could go and not have a wobbly joint.
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I would like to figure out how to do a circular form as well. Anyone got any ideas?
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Just use a soft wood form you can bend and stake where you want. A 1/4 inch paneling will probably do the job.
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I’m looking to build a mold that would be half a circle that would connect together similar to the video rather than in the ground pouring. I’m thinking those concrete tubes but I’d want to make it reusable so I’m trying to figure out the best way to make the mold.
Can someone familiar with construction tell me how much this material cost compares to wood?
For example, 2 in. x 12 in. x 10 ft board of pressure treated lumber costs about $20 - actual dimensions are 1.5 x 11 in. Ignoring the cost of the form, how much would the concrete and mesh cost?
You can still do the same thing. Just put a board on the bottom. Stake out the bend how you want it with thin plywood. When you get where you want to be cut a piece to fit from the top you can just slide down to the bottom. The stakes hold everything in place. You may have to trim a bit of concrete that pours out cracks but that really should be very limited
That’s hard to say. If you consider the concrete will basically outlive you. Fast setting concrete is cheap. You can use old wood for a form if you can find it. Otherwise just use the cheapest you can find. It will most likely be one use. https://www.homedepot.com/b/Building-Materials-Concrete-Cement-Masonry-Mortar-Cement-Concrete-Mix-Concrete-Mix/Fast-Setting/N-5yc1vZcdptZ1z19a9e
Rebar is very cheap. Type it in the home Depot search
@dimitri_7a
Rough
Cost of concrete ;
(Check my math )
Concrete is sold by the yard ( in a truck) about $100 / yd.
1cu. Yd. =46,656 cu. in.
A concrete peice 4" x12"x10’ = 5,760 cu. in.
( approximate size of your board above)
So about 8 of these per yd.
Or ~ $12 each
This is not including delivery fee.
Minimum load is usually 3yds. And delivery fee is ~ $100 per load
Up to 10yds per load.
This Obviously varies with location
This is not including forms or labor.
If you don’t have concert experience , would not recommend by your self. Form construction must be strong!
.get someone with experience to help do this.
You can rent concrete forms for large pours.
Mixing by the pre mix bag method , is very expensive , and labor intensive.
You can have sand , gravel, and Portland cement delivered , and rent a mixer. Inexpensive , a lot of labor , but can pour small batches at a time. Move forms, pour more tomorrow .
Concrete lasts along time, make sure you know what you want.
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I’ve used fiber reinforcement before. I bought a few bags from Amazon. It seemed to work ok. I believe one bag was for 1 cubic yard. I think I weighed the bag in grams, then divided by 27 (1 cubic yard equals 27 cubic feet ) to know how much to use per cubic foot. As I recall, it wasn’t that expensive, but that was probably 6 years ago.
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I made some concrete planting rings before. If I remember correctly, I basically made two circular forms out of green fiberglass landscape edging. I made 4 quarter circle bracing forms out of 2x4s to hold the shape of the inner ring, then cut notches out of scrap pieces of composite decking to clip around both rings which held the rings’ shape when filled with concrete. I don’t exactly remember all the details, but here is a link with a picture. Looking for an inexpensive tree ring or edging material - #13 by ztom
I made several in my garage and they worked ok. Some stayed in one piece, but some broke in half, probably because I took the form off too soon. They still worked though, I just put the pieces together in the field. Eventually I made the notches a little wider in order to make the ring thicker. Also, I eventually just took the forms outside and poured in place. This worked a lot better.
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or just buy concrete blocks at ~1.25$ each and easily stackable since they are totally ‘squared away’ facilitating building garden beds like lego. May not even need a mixer since you simply just apply masonry mix at the rims of the hollow blocks, so won’t need large amounts of concrete. Posted our process of building concrete garden beds here. Totally agree though that it is a lot of labor, but way more productive than having to go the gym. Pumping iron only builds muscles.
Handling, transporting, and manually mixing cement slurries and concrete not only just build muscles, but also builds long-lasting stuff 
Yes concrete block is a option.
I am not advocating anything here really.
There are many ways to do things.
Just answered the question ( roughly ) of costs of concrete
I don’t have concrete garden beds, but have poured more than my share, great stuff, like liquid rock
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your suggestion is actually superb for large-scale production. Actually want to buy and not just rent a mixer myself, but afraid my concrete aspirations would snowball into extravagant proportions haha
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this one is so tempting, at just 200 bucks and free shipping!
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We had an old school one when I was a kid , used it for all kinds of stuff. I poured a slab addition to my parents house 20 x 40 with it when is was 18.
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quite certain that slab you poured is still there and doing what it is supposed to do. Cement is extremely fascinating just as it is functional. The romans made wonders with it and the appian way, pantheon etc are just a few examples of timeless strength, form, and function.
interesting that some literature say that while cement quickly attains near max strength after a month of being poured, it seems to mysteriously slow down attaining its peak strength and continue to get stronger and harder with time over hundreds of years. Thus said, you wouldn’t even know when that slab you poured 5 years ago () at your parents’ home may have attained peak strength, or if it is even possible for us short-lived humans to determine what cement’s peak strength might be.
acid rain, salinity, tree roots, thermals/water expansion(freeze) damage are some real threats to concrete, but after a couple thousand years or so, the pantheon and appian way continue to serve their purpose well…
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So true, juju, that slab was poured 23 years ago, they remodeled and put a subfloor on top of it but it still serves its purpose. I built an off grid cabin on their property several years ago, with a special collection of stones on the floor. One is an igneous rock from the Rocky Mountains, some day someone will wonder how it got there.
a thousand years from now, archaeologists will have to collaborate with genealogists/county records, and sieve the web for possible leads, if their A.I. is powerful enough to find the evidence you posted here at growingfruit.org 
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I am wondering what happens if it needs to be taken apart.