The Garden of Eden is a highly secure garden where only those with a Dragon Cave account can enter. You'll need to sign in to add your plants dragons.

The above link will take you directly to dragcave.net. The Garden of Eden only stores your user id and username, not your password.

Without signing in, you can still give views and clicks, but you won't be able to add your own plants. You're basically looking through the gate and waving at the plants like a madman.