All parts of the plants are edible though it is the flowers that are most frequently used.
(All parts of the plants; are; edible) (it; is; the flowers that are most frequently used) (the flowers; are; most frequently used) (the flowers; used; T:most frequently)
All parts of the plants it the flowers the flowers
are is are used
edible
the flowers that are most frequently used
most frequently used
T:most frequently