How does the Chenopod shrub survive?

Answer 1

Simply because evolution has adapted it to it's environment.

Answer 2

The Chenopod shrub is adapted to survive in arid environments with limited water availability by having the ability to store water in its leaves or stems, reducing water loss through small leaves or vertical orientation of leaves, and having a deep root system to access underground water sources. Additionally, some Chenopod species have developed mechanisms to excrete excess salt through specialized glands or structures, allowing them to thrive in saline soils.