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Birdbath as a Planter Try this pretty display that isn’t just for the birds. Plant shallow-rooted succulents in the birdbath with soil. The lack of drainage will keep the soil moist, so you’ll need to water even less frequently than usual.
DIY: PVC Pipe Strawberry Planter: it seems pretty clear that they have taken a length of PVC drainage pipe, cut out holes for the plants and then filled it with soil. I could see 3 or 4 of these in a row along a sunny fence. Holes are cut in the sides of the pipe and seedlings planted into them. The tower is watered from the top down.