[TT3351]

>Growing in warehouses or vertically forces you to substitute the sun with artificial lights

Couldn't one construct pylons outdoors for planting? I don't see why it wouldn't work if you constructed it narrower at each successive plant height.

Some indoor vertical farming I've seen rotates the entire vertical structure, necessitating only one light facing a section of the column. I would expect this kind of rotation might help outdoors as well.

[stretchcat]

One constraint to keep in mind is how quickly and efficiently the field can be harvested. If you're talking about a crop that is harvested by hand then this isn't really a factor. But if you're trying to grow a crop that is usually mechanically harvested, you have to compete with that efficiency with machines of your own that are compatible with the structure of your farm (or content yourself with selling luxury produce priced for the wealthy.)