The kingdom of Assyria stood like a mighty, magnificent tree, radiating an unprecedented beauty and power that stirred deep envy in all who beheld it. Yet, the true source of this strength was not earthly. God clarifies that He alone granted this greatness, deliberately stripping away the king's pride to prevent him from claiming that his own hands had built such an empire [רד"ק]. The breathtaking appearance of this tree came from its dense canopy of high, reaching branches [ביאור שטיינזלץ, מלבי"ם]. In the political realm, these sprawling limbs represent the Assyrian king's vast dominion, upheld by a massive network of powerful ministers [מצודת דוד].
Such unrivaled might naturally sparked intense jealousy among the trees of Eden [מצודת ציון]. The primary approach among commentators is that these trees serve as a metaphor for the finest kings of the earth. Watching this uniquely massive and beautiful empire flourish, the world's leaders were consumed by envy [רש"י, מצודת דוד, ביאור שטיינזלץ].
Beyond the political landscape, a deeper spiritual drama unfolded. The trees in God's garden also symbolize the souls of the righteous, the holy forefathers, and the heavenly angels who reside close to Him. These pure spiritual forces looked upon the boastful tree—whose roots were firmly planted in a place of impurity far outside the sacred garden—and felt a righteous jealousy. This provoked them to stand against the arrogant empire, pouring out prayers and pleas before God to dismantle it. Ultimately, God heard their cries and brought the haughty kingdom to its end [מלבי"ם].