The Ivy Generator automatically calculates two polygon selections, one for the tendrils and one for the leaves, also providing UV coordinates for these elements. The names for these selections can be defined here. Correspondingly named Selection tags are automatically made available in the Object Manager at the Ivy Generator, or are available under the names used in the Node Editor.
For realistic texturing of the leaves, you can directly access a special ivy material that is made available via the Asset Browser. You will find this after searching for Ivy in the Material section of the browser (full name of the material: English Ivy - Single Leaf).

Branches

The name entered here is used for the Polygon Selection tag, which contains the tendril areas. By defining this name in the Selection field of a Material tag assigned to the Ivy Generator, the corresponding material can be automatically restricted to the polygons of the tendrils.

Leaves

The name entered here is used for the Polygon Selection tag, which contains the leaf polygons. By defining this name in the Selection field of a Material tag assigned to the Ivy Generator, the corresponding material can be automatically restricted to the leaves of the tendrils.