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 coal at the bottom of the containers put more effort onto their projects
( z1 effort :ARG0 ( z2 person :ARG0-of ( z3 grow :ARG1 ( z4 plant :ARG0-of ( z5 have :ARG1 ( z6 coal ) ) ) :location ( z7 bottom :part-of ( z8 container ) ) ) ) )