I think there's a difference in what is perceived as 'standard' between the two languages. English basically gives you a very rich vocabulary that has pretty much preset terms - common, legal, official and academic - for all concepts. German basically gives you a set of rules, a set of word stems and the rest is "Usus", i.e. the way it is commonly used, which is weaker than being part of an official standard. So different regions may have different official terms for the same thing because there is no standard to tell them otherwise - consensus is only reached through interaction. I think that's similar to how it works with English in the UK though.

Now, when it comes to the initial rules, they are common to all dialects, albeit with some variations (vowel / consonant shift etc.). So the "Be" in Begrünung would be universally understood as indicating a human activity in this context, rather than a passive process.