Apparently Koichi can understand what plants are saying.
This is mulch from the vegetation.
I don’t have a green thumb but I like to grow plants.
Plant things are plants or vegetation.
This is a jukugo word, which usually means on'yomi readings from the kanji. You'll need to remember the 物 reading as ぶつ, though. Why? Because you like looking at plant butts. You get off on it. You're weird like that. Imagine this.