This study aims to give a clear picture of the extent of the response of wild plants to the environmental factors prevailing in the Qassim region, which contributes to knowing and understanding the extent of their adaptation to the environment of this region. In this research, environmental and physiological studies were made on some desert plants naturally growing in the Qassim region of the Kingdom of Saudi Arabia. And a group of plants were selected: the cactus plant, the corpse plant in both the yellow environment, the yellow unicorn environment. The study was divided in this research into two main parts, the first section: the environmental study, in which a physical and chemical analysis of soil samples was carried out at two depths (0-15 cm) and (15-30 cm) under each plant species under study. The second section: is the physiological study of the plants under study, in which the moisture content of the plant, the total ash and the quantitative content of pigments (chlorophyll a, chlorophyll b, and carotene) were studied (in addition to the metabolic processes within the plant) the amount of protein, carbohydrates, fats, nitrogen, and mineral elements: sodium potassium Calcium-magnesium-iron). It was found through the mechanical analysis of the soil that the soil under the perch plant and under the shrimp plant was sandy in a flat yellow environment at the depth (0-15 cm), and sandy loam in an unaizah yellow environment at both depths, and the results of the content assessment showed The humidity of the soil that the moisture increases as the depth increases. It was observed through chemical analysis of soil that it is alkaline in all the environments under study, when measuring the pH of the soil. As for the physiological results, the plants under study showed different levels of moisture content in their cells. As for the amount of ash, it varied between plants in a yellowish environment, and close to one in a yellow environment. Consequently, the study recommends that Pulicaria crispa and Zilla spinosa have the ability to adapt to dry desert environment conditions, and therefore we recommend that more studies and research be conducted on them.