Doc talk:2.6/Manual/Modeling/Meshes/Vertex Groups/Vertex Groups
"Vertex groups only apply to Mesh and Lattice Objects. Any other Object type has no vertices, hence it can not have Vertex Groups."
Not quite true: curves and surfaces also have vertices. Why can the concept of vertex group (sets of control points) not be extended to curves?
Tom Telos 15:51, 22 February 2015 (UTC)