What zone of earth is most difficult for a plant to live in?

The most difficult zone for a plant to live in is the desert biome, characterized by extreme temperatures, low precipitation, and nutrient-poor soil. These harsh conditions create significant challenges for water retention and growth, leading to a sparse plant population. Additionally, factors like high salinity and intense sunlight further complicate survival. Plants that do thrive in deserts have specialized adaptations, such as deep roots and water-storing tissues.