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.
The containers can hold up to a pound of charcoal
( z1 possible :ARG1 ( z2 hold :ARG0 ( z3 container ) :ARG1 ( z4 charcoal :quant ( z5 up-to :op ( z6 mass-quantity :quant 1 :unit ( z7 pound ) ) ) ) ) )