I've been trying to get OSM to mark this as a green rectangle, which it apparently won't do if you mark something as a garden. But it still doesn't do so after I changed it to a "park" as I have seen done elsewhere for some rooftop gardens. And certainly I see some ground-level lot-size community gardens in the neighborhood are marked on OSM as "parks" and have signage saying that.

So, IDK. I give up. Do whatever you think best.

I think there's a URL in the POI if you want more info. If not, see https://thelotusgarden.org