1. Rukkha Sutta.– Just as a tree that leans towards the east falls to the cast when cut down, so does a monk who cultivates the Eightfold Path incline to nibbāna. S.v.47.
2. Rukkha Sutta.– Mighty trees, grown from tiny seeds, overspread other trees and kill them; so are householders destroyed by their lusts. There are five hindrances (nīvaraṇa) that overspread the heart; the seven factors of enlightenment (bojjhaṅga) are not like them. S.v.96 f.
The Dutiya, Tatiya, and Catthutarukkha Sutta compare wisdom to the Pāricchattaka tree of Tāvatiṃsa, the Cittapāṭali of the Asurā, and the Kūṭasimbalī tree of the Supiṇṇā respectively. S.v.238.