In stanza 2, what does the persona use to represent the growth of his anger?

In the second stanza of the poem "A Poison Tree," the speaker uses the nurturing of a growing plant to represent the growth of his anger. In the poem, the speaker describes how the metaphorical tree is watered and provided sunlight through his tears, fears, and sadness, and through his vengeful smiles. The speaker is referring to how his wrath begins to grow toward his enemy as he nourishes it instead of talking though the issue with the person. In the second stanza, the speaker is in the beginning stages of growing his tree poisoned by wrath. The anger is nourished and grown by the speaker's fears and resentments until it becomes a full-grown tree. In the second stanza, there is a sense of intentionality set with how the speaker chooses to nourish his wrath.