Nor do hemp plants require chemicals to fight insects or even weeds--the plants grow close together and have flowers at the top of the plant, which shut out light, which chokes out weeds.
(light; chokes out; weeds) (the plants; have; flowers at the top of the plant) (the plant; shut out; light, which chokes out weeds) (the plants; grow together; close)
light the plants the plant the plants
chokes out have shut out grow together
weeds
flowers at the top of the plant
light, which chokes out weeds
close