Final answer:
The metaphor used to describe the speaker's desire for acceptance is a 'growing tree,' symbolizing personal growth and the longing to bloom into acceptance.
Step-by-step explanation:
The metaphor used to describe the speaker's desire for acceptance in the given examples is a growing tree or more specifically, a tree that blossoms, indicating a yearning for personal growth and the blooming of acceptance. In the text given, the Tree's reluctance to provide yellow roses demonstrates a connection to the natural world, with the mention of flowers and growth. Moreover, the text with the germ of a plant shooting upward and the subsequent growth is another explicit metaphor of aspiration and flourishing.