BG 15.1-2
The Blessed Lord said: With roots above, branches below, the Asvattha is said to be indestructible; the leaves of it are hymns; he who knoweth it is a Veda-knower. Downwards and upwards spread the branches of it, nourished by the qualities; the objects of the senses its buds; and its roots grow downwards, the bonds of action in the world of men.