We quite often see the term 'Beer Garden' used by reviewers and pubs, but what exactly is the difference between a beer garden and a pub garden?

Having spent time in Germany, where a 'Biergarten' implies somewhere where beer is actually served - rather than just taken to after purchase from the bar - I think I suggest a beer garden is a garden in which you can actually buy beer, either from a bar in the garden itself or by ordering from the staff and having it brought out to you. A pub garden where you just go and drink beer you've bought inside, is, I suggest, just a pub garden where you drink beer rather than a Beergarden as such.

Or am I overthinking this? What does everyone else think?

(I shall now take a beer into my garden to ponder this.)