The Collaborative International Dictionary
Plantless
Plantless \Plant"less\, a. Without plants; barren of vegetation.
Wiktionary
plantless
a. Without plants (non-animal organisms).
Usage examples of "plantless".
A perfectly flat, treeless, plantless, grassless expanse all the way to the southern horizon.
The girl appeared with her plantless pot, and saw that all the other candidates had achieved wonderful results: each girl bore a flower lovelier than the last, in the most varied forms and colours.