This sentence is a sentence that explains the author's living environment. Moss is green, growing on the steps, and grass is green, reflected in the curtains. It shows that the author's mood is elegant, and he thinks that only my moral character is beautiful (I don't feel humble).
"The moss on the upper stage is green, and the grass in the curtain is green", which is a famous sentence in My Humble Room Inscription. The "moss scar" here means that plants are called "scars" because.
Its plants-herbs.