Unlike most weeds which compete for soil nutrients, parasitic weeds tap directly into the host's root system and saps the energy of the host plant.
(most weeds; compete; for soil nutrients) (parasitic weeds; tap directly; into the host's root system) (parasitic weeds; saps; the energy of the host plant)
most weeds parasitic weeds parasitic weeds
compete tap directly saps
for soil nutrients
into the host's root system
the energy of the host plant