There are two different worlds that look almost exactly like this. The first is the world directly down in the Nexus in which you can obtain the watering can effect. The other world can be found by going through the plant labyrinth world and houses the ghost effect.
In both areas are white static ghosts more for decoration and white flowers that sway back and forth. There is also a ghostly girl in each area and the area that you're in will change the effect she gives you. In the first area are also little white and grey ghostly balls that float about and can be hit.
- Nexus > Ghost Garden 1
- Nexus > Pipes and Phone Poles > Apartments 1 > Industrial Snow World > Plant Labyrinth (Past) > Plant Labyrinth > Ghost Garden 2
Ghost Garden 1
- Underwater (by going through the two pillars)
Ghost Garden 2
- Overgrown Islands (by interacting with the field of flowers)
- Plant Labyrinth (by going through the arch way)