I’ll begin by saying that I support the idea, and I hope that in this month and a half that has passed since your post, you haven’t trashed the tub! At my university, we just started a community garden, and currently have an herb garden, doing wonderfully, in an old wheelbarrow. This container works great, so there is hope with yours, too. Drainage is a big deal though, as drowning plants is most times worse than not watering them enough. Simple solution—drill some holes. The tub is probably pretty heavy duty, but I’m sure there’s a tool out there that can do it. Depending on the size of the tub, drilling ~4 additional holes should be plenty. THEN you could line the bottom with a few clay pieces/gravel to keep the water from simply dripping out right away.
(For an alternative idea, if you’re interested: we have a friend who found an old bathtub like yours, and uses it for making incredible worm compost. The drain at the bottom works amazingly to obtain the “worm tea,” which she then uses to water and nourish her plants. Just a thought.)
Good luck, and happy gardening!
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