I don't want to put down people who buy those elevated planters for $100.00, maybe that's exactly what they want or need, but I try to get the word out that you can just walk over to the home storage department and get a bigger, stronger tote and use that as a planter for only $20.00.
I have 3 of those rubber feed pans, but none as big as 40-gallons. They do last forever. However, where I live, they are quite expensive. I think the biggest one at our Fleet store is only 2-gallons and that sells for $10.00. Much too small for use as a planter.
They do have one oval container that is 40-gallons, but I don't know if it is made out of that heavy rubber. I have never seen it sold where they have the rubber feeder pans. I will have to check it out next time I go to the Fleet store.
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At $50.00, it's half the price of that $100.00 elevated planter at Menards, but more than 2X as much as one of the $20.00 industrial black totes.
Yeah, I probably think about costs maybe too much. If you need a watertight container for a wicking planter, or a container that you can put out on your deck, then the 40-gallon black totes would great at $20.00.
Having said that, I make 4X4 foot 16-inch-high raised garden beds out of free pallet wood and that costs me less than $2.00 for the screws and nails I use to build it. That size of raised bed holds 160-gallons in comparison. I fill the bottom with free hügelkultur wood and top it off with topsoil and chicken run compost mixed 1:1. It's not waterproof, but they work really well with the hügelkultur wood which acts like a giant sponge holding water until the plants need it.
Here is a picture of one of my $2.00 pallet wood raised beds version 2.0 filled with cherry tomatoes...
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For raised garden beds out in the yard, that pallet wood raised bed is my best bang for the buck. I should get at least 5 years out of it before it needs to be replaced. But I made it so it is easy to replace a few rotted boards, if needed. With luck, I might get even more years out of it. If not, I can make another new $2.00 pallet wood raised bed in about an hour or less.
That's pretty frugal!