They are an unusual shape for plants and too small for perennials or shrubs but I like them and would probably use them for my summer herbs such as parsley and basil, near the kitchen door so highly visible.
However, as with others, I'd be concerned about the likelihood of rotting so have you protected the inside would with oil or a good yacht varnish? I'd also be worried about their feet if they're intended to stand in a drip tray and be permanently wet.
Vendée - 20kms from Atlantic coast. "We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
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If not, you can't grow anything directly in them, and as @Joyce Goldenlilysays, you can't get pots that shape to insert.
The ply would need to be exterior ply if planting into them directly, to make them sustainable. They would warp and rot quite quickly otherwise
I live in west central Scotland - not where that photo is...
However, as with others, I'd be concerned about the likelihood of rotting so have you protected the inside would with oil or a good yacht varnish? I'd also be worried about their feet if they're intended to stand in a drip tray and be permanently wet.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
I'd echo @Obelixx's concerns about the timber though, especially the bottom of the legs.
Perhaps they could have some of the acrylic on them?
I live in west central Scotland - not where that photo is...