From PinataIsland.info, the Viva Piñata wiki
Your choice of Garden Pieces will determine which of the piñata species are attracted to your garden, since they all have individual requirements. Sowing grass, digging ponds, planting flowers and trees, and growing vegetables all affect which of the unique piñatas you will see. It's not just about plants, either. There is a whole range of garden ornaments and structures that could be decisive. These garden pieces are unlocked through game progress, bought in the shops at the village, and awarded for attracting wild piñatas or obtaining baby piñatas via a romance dance. Your reward for creating an appealing paradise is to watch the piñatas visit and eventually reside there, which is when the fun really starts.
Plant life is what you put in your garden, like trees and flowers and bushes and, well you get the idea. Plant life comes in many forms, like daisies or tulips.
So now put tons of plant life in your garden? Mmmm'kay?
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