A few growers place charcoal in the bottom of containers to absorb excess salts and maintain sweet soil, if plants are grown more than a few months.
Growers think growing plants is stupid.
Growers may be forced into the occupation and think that their occupation is stupid on occasion. The feelings of the growers are not discussed in the text. I think the system is making assumptions based on surface level evidence.
( z1 think :ARG0 ( z2 person :ARG0-of ( z3 grow ) ) :ARG1 ( z4 stupid :domain ( z5 grow :ARG1 ( z6 plant ) ) ) )