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.
People who grow plants with charcoal at the bottom of their containers know they will have healthier plants
( z1 know :ARG0 ( z2 person :ARG0-of ( z3 grow :ARG1 ( z4 plant ) :instrument ( z5 charcoal ) :location ( z6 bottom :part-of ( z7 container :poss z2 ) ) ) ) )