Instructions
Visit Miss Petula's Paper Pets Shop, one of Paradise Island's nine shops. Purchase a Ponocky for 2100 coins. It will also cost an additional 1155 coins to house, so keep that in mind when you are ready to purchase the Ponocky.
Cover your garden with 500 square pinometers of grass. This equals exactly half of your garden space. Having the Ponocky and the grass will attract a Horstachio to your garden.
Go to Costolot's General Store and purchase eight apples for 100 coins a piece.
Stay in your garden and wait to see a Horstachio appear. When it does, feed it all eight apples. This will make the Horstachio a permanent part of your garden.