The first wave of Tamagotchis (1996/1997/1998) were a fad. Everybody had to have one. Bandai wasn't prepared for this. By the time Bandai had enough production lines active, the fad was over. Interest in Tamagotchis had collapsed. I imagine Bandai America cancelled the Tamagotchi Garden because they had millions of unsold (and unwanted) original Tamagotchis in their warehouses, and figured there wasn't any demand for new Tamagotchi versions.
I don't know if they ever made any English-language samples of the Tamagotchi Garden. This is all I have been able to find. A pin:
http://i59.photobucket.com/albums/g310/bin...s/pin-front.jpg and a brochure: (the "US Version" link on this page:
http://www.mimitchi.com/html/morino.htm )