I speak English perfectly, no need for terrible translators (Yandex literally wrote “Garden Friendship” – the correct one is zahrádkářský spolek, DeepL is pretty close).

I think we used to have these “gardeners’ clubs”, the writer Bohumil Hrabal (look up some Menzel films based on his books) referenced his, called Zahrádkáři Kersku (Gardeners of Kersko) in Slavnosti sněženek. However, it was voluntary and more of a cooperation club where members shared produce, seeds and experience, rather than having to follow aesthetic rules (besides peer pressure). I don’t think we have those anymore, the culture is way more individualistic; also, Kersko is a village of recreational homes. We don’t really have suburbs: single family homes have fences around their gardens and nobody cares what you have behind one.

On the other hand, most blocks of flats have a bytové družstvo (Flat Collective) with mandatory membership. These are quite strict, usually run by old women that have lived there for decades and they operate like HOAs: they dictate where you can park your car or bike and what you can hang on your door, you must go through them to change a doorbell nameplate, they facilitate repairs of shared equipment, collect fees if you rent the flat to someome else etc.