Please learn how to read.
He read it.
He said crops can't grow on green wool.
Night,pigs,cows,or some stuff can't spawn on fields,so you're fine.
Cactus grows on sand. So don't worry about that either.
Flowers you're going to have to plant somewhere else.
Same with reeds. Or you can eliminate all grass from an area,block off with sand,grow cactus on the sand,lay grass blocks next to water and no grass will grow.
Poll