Gardenia is on Earth, within the Solar System and outside the magical dimension of Magix.
It is the planet where Bloom grew up with her adoptive parents before coming to Alfea. There are fabulous landscapes on earth, each one different from the next. There are very high mountains, lush forests, but also dry, arid deserts. There are immense oceans where te can even play with dolphins, and thousands of different fiori with thousands of different scents!
It is difficult to define the quantity and the variety of animali and plants. Basically it is full of life, of different cultures and people who even speak different languages.