From the Super Mario Wiki
Flowerbed Return is Daisy's Defensive Power Shot in Mario Power Tennis. Daisy spins once, summoning a path of flowers leading to the ball, leaps over the flowers, and returns the ball. This causes the ball to bounce across the court at average speed and Daisy stays in the location she hit it from.
Unlike most other Defensive Power Shots, the Flowerbed Return can miss if the ball is too far away.