How to tag a hydroponics facility? Creating a new key for it

I was adding a small scale hydroponics farm. I got caught up in doubts about how to best tag it. The place is not bigger than a house and its features made me second guess tagging it as landuse=farmland.

Some examples found on the DB are:

Looking for hydroponic on the wiki returns no results.

I have even considered landuse=farmyard and landuse=industrial owing to their indoors nature.
A new key, hydroponic=yes/no/only, could be useful. I’ve tried using taginfo to fish for usage precedents. It looks like it hasn’t been used yet.

Please share your experience and thoughts. Thank you.

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Probably more likely to be a tag on a landuse=greenhouse_horticulture area or a subtag of a greenhouse?

There’s an existing irrigation key that might be suitable with a new value.

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You need to consider aquaponics, fogponics, and aeroponics together.
Not sure vertical farming or all hydroponics is “greenhouse”. I like the idea of using irrigation. This can cover drip and mist irrigation.

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