Download Foliage plant from Quixel
Top menu, Choose Landscape mode → Manage
Create new
(choose the mossy plant material as below, set the size, then click create)
Choose Foliage mode, drag the downloaded quixel plants into +Foliage column
Select all those dragged plants, choose paint brush on top, then paint in the scene
Open the used plants materials instance, enable the wind functions and parameters:
Play the game to see the wind effect on foliage