Is there a 4th chao garden?

No.

Nope - just the (1) Hero, (2) Dark and (3) Neutral Garden...

No. There is only 3 chao gardens.

There are rumurs(sorry for misspelling) about it but I would guess not.

Only three.

No,there are,Tiny Chao Garden,Hero Garden and Dark Garden

Yes,there is,but no chaos garden.there is neutral,dark,hero and don't forget the tiny garden.its still part of the game!!!just get a gameboy and a cord for the gameboy to the game cube.then just put your chao in the game boy in every garden.now you can take your chao with you!!!!

I guess theres only 3 but in hero garden you can c sm thats far away like a clock onn this island;.........hmmmmmmm I wonder what it cud b

Yes it's called toxins garden it's basicly a good place for hatching them or teachin them to fly but you must watch them at all times the water there is deep and your chaos can drown there if the strugle for a certain amount of time,this garden is also home to a fruit tree that can change your chaos collor lik blue to black purple to red yellow to bla bla basicly you get the point

I've heard rumors of memory garden were chao that died live. Also has clear chao egg in it

There are 4 gardens, actually 7 if you count all gardens. Station square, mystic ruins, egg carrier, tiny chao garden, hero garden, neutral garden, and dark garden

There are, Neutral, Hero, and Dark (and if we exclude Tiny) Chao Playground. It's only accessible through means of modding the game, but impossible on console copies of the game.