I never have with rooting hormone.
Vine and cane plants clone the best. Tomatoes, raspberries, black berries, cucumbers, etc...
The next easiest are plants with runners like strawberries.
Tough ones are woody stemmed, like peppers when they start to develop veggies, blue berries. Just as tough are plants without stems, like squashes.
You want to take cuttings for clones prior to them starting to develop flowers.