Could I interest you in a tabard?
On a more serious note I doubt I’d have hit 20 very quickly just doing a super bloom a week. I wanted to get the goodies so I did the grind. I didn’t really go beyond the first five seeds because those are the ones that give effective rep, but I did do all the WQs. I also found all the treasures, killed all the rares, did some achievements etc.
There are also mounts/toys/pets etc all the usual to be gained. It’s going to take me a considerable amount of time to grind all the items.