Germination
Sprout
noun, する verb
A sprout that sprouts can thank germination for being able to sprout nice and big and strong.
ほうが
This is a jukugo word that uses the on'yomi readings of the kanji. You haven't learned this reading for 芽 yet, so here's a mnemonic to help you:
When a plant sprouts out of the ground it's still a baby so all it can say is goo goo ga ga (が).
あなたの役目は、二人の恋の萌芽を絶つことよ。
Your duty is to suppress the germination of love between people.