Currently garden on wiki at https://wiki.openstreetmap.org/wiki/Tag:leisure%3Dgarden <https://wiki.openstreetmap.org/wiki/Tag:leisure%3Dgarden> is described as not just any place where plants grow but as requiring it at least planned.
Despite that people frequently use it for areas that include nothing more than standard lawns (like at https://commons.wikimedia.org/wiki/File:Tiny_homes_-_Davey_Crescent_-_geograph.org.uk_-_755400.jpg <https://commons.wikimedia.org/wiki/File:Tiny_homes_-_Davey_Crescent_-_geograph.org.uk_-_755400.jpg> ) or areas overgrown with random plants ( https://commons.wikimedia.org/wiki/File:Rusinovo_dacha_02j.JPG <https://commons.wikimedia.org/wiki/File:Rusinovo_dacha_02j.JPG> or https://commons.wikimedia.org/wiki/File:J8320fvfRealdeCacarong_04.JPG <https://commons.wikimedia.org/wiki/File:J8320fvfRealdeCacarong_04.JPG> ) and generally places that does not indicate that there was any attempt to create "distinguishable planned space, usually outdoors, set aside for the display, cultivation, and enjoyment of plants and other forms of nature" (like https://commons.wikimedia.org/wiki/File:Tiny-house-005.JPG <https://commons.wikimedia.org/wiki/File:Tiny-house-005.JPG> ). Due to popularity of this kind of tagging I will edit https://wiki.openstreetmap.org/wiki/Tag:leisure%3Dgarden <https://wiki.openstreetmap.org/wiki/Tag:leisure%3Dgarden> to mention that such areas do not qualify for leisure=garden (I am posting also here to make sure that my edit will be verified).
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