What is a figure of speech in the poem "A Poison Tree" by William Blake?

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The poem uses a metaphor to compare anger to a tree.

A figure of speech is the use of language that is not literal.  In the case of this poem, the entire poem is figurative.  The poem compares a tree to a person’s feelings.  The poem uses metaphor, which is a comparison between two things. The tree becomes a metaphorical representation of the anger.

The poem describes the speaker’s wrath.  When he does not tell anyone that he is angry, the anger just festers like a growing tree. 

And I waterd it in fears,

Night & morning with my tears: 

And I sunned it with smiles,

And with soft deceitful wiles. (Stanza 2)

The metaphor the speaker uses is to say that he watered his anger and his anger grew.  He watered it with his tears, meaning that as he cried and fretted about whatever it was that made him angry, the anger grew and grew. The speaker did not literally plant anger, and it is not literally growing. That is why we call it a figure of speech.

And it grew both day and night. 
Till it bore an apple bright. 
And my foe beheld it shine,
And he knew that it was mine.  (Stanza 3)
Something that is figurative can still be represented by something literal.  For example, the speaker can plant a tree, and compare it to his anger.  He could be using the tree to lure his enemy in, so that he can kill him with poisoned fruit.  More likely he is acting on his anger.
 
The poem is a metaphor for what happens when we let our anger fester instead of dealing with it.  We get angrier and angrier until we act on our anger, and possibly even kill the person who is making us angry.  Anger is a poison, and it can lead to destruction both of the angry person and the object of his anger.
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