Burnet has the characteristics of drought tolerance, cold tolerance and strong stress resistance. Burnets have roots that go deep into the ground and are able to absorb water and nutrients from deep layers. Special cells within the root system of the Burnet are able to store water in large quantities and then release it to protect the plant in the event of drought.

Ulmus officinalis is a perennial herb of The genus Ulmus officinalis in rosaceae, with fusiform thick roots, short petiolate leaflets, purplish red petals and calyx tube containing fruit. It is also known as "Yellow claw xiang", "Yuza", "yuzi" or "sour zhe". Distributed in the north temperate zone.