You can even plant the flowers on the boat in the middle of the mirage...
Not really sure why you started a new Dwarf for the achievement, unless you had a Death Knight on the server already.
I have a very minor gripe. When I clicked the image on the home page I expected (wanted) to go straight to the noblegarden guide. Instead the first link took me to a ... very useless page with a bunch more links, one of which took me to this thread, where the link to the actual guide was (finally!) That's a bit more clicking than I wanted.
I found it amusing that the first title my rogue would have would be "the Noble".