Wind is disabled by default. Select a foliage model, click the Modifier tab, enable the viewport and render toggles on the Geometry Nodes modifier, then raise Wind Power above 0. Wind Power controls how much the plant moves, while Wind Speed controls how quickly the movement changes. If you add multiple plants to your scene, you can use the Wind Control empty to keep the wind direction consistent for all assets in your scene. Just add the empty to your scene and add it to the "Wind Controller" section of the Geometry Nodes modifier.