If the product provides something the plant needs that is lacking in the soil where it is growing, it will help.
(the product; provides; something the plant needs that is lacking in the soil) (it; is growing; L:the soil) (it; will help; ) (the plant; needs; that is lacking in the soil)
the product it it the plant
provides is growing will help needs
something the plant needs that is lacking in the soil
L:the soil
that is lacking in the soil