Thorn is a sharp-pointed
stem which has tiny
leaf scars and arises from a
bud whereas spines usually develop from the
leaves. Because of this, breaking a
thorn off the plant damages the surrounding
Thorns are hard while spines are comparatively soft. Itís main function
is the protection from the enemies.
Prickles and spines are technically different from thorns, but have
the same overall effect.