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 who use charcoal in the bottom of their containers have peace of mind
( z1 have :ARG0 ( z2 person :ARG0-of ( z3 grow ) :ARG0-of ( z4 use :ARG1 ( z5 charcoal ) :location ( z6 bottom :part-of ( z7 container :poss z2 ) ) ) ) )