Ikhlaas and Tawheed is a tree in the heart. Its branches are the the Actions, and its fruits are the good life in this dunyaah and everlasting bliss in the aakhirah.
And just as the fruits of Jannah are neither cut off (by change of season) nor out of reach, likewise is the case with the fruits of Tawheed and Ikhlaas.
Shirk, lies, and riyaa is a tree in the heart. Its fruits in the dunyaah are fear and anxiety, grief and distress of the breast and oppression upon the heart. Its fruits in the afterlife are the tree of zaqqoom and an everlasting punishment.
And Allaah has made mention of these two trees in soorah al Ibraaheem:
”See you not how Allaah sets forth a parable? A goodly word as a goodly tree, whose root is firmly fixed, and its branches (reach) to the sky (i.e. very high). Giving its fruits at all times, by the Leave of its Lord, and Allaah sets forth parables for mankind in order that they may remember. And the parable of an evil word is that of an evil tree uprooted from the surface of earth, having no stability” (14:24-26)