Final answer:
The primary contrast in the given excerpt is between fragility and vigor.
Step-by-step explanation:
The primary contrast in lines 1-5 of the given excerpt is between fragility and vigor.
The enjambment between the words 'break' and 'blossom' creates a contrast of a harsh and violent tone with a tone of blossoming and growth.
This contrast highlights the contrast between fragility and vigor.