Grafting a measured lamination on a hyperbolic surface
defines a self-map of Teichmüller space, which is a homeomorphism by a
result of Scannell and Wolf. In this paper we study the large-scale behavior of
pruning, which is the inverse of grafting.

Specifically, for each conformal structure *X*
*T*(*S*), pruning *X* gives
a map *M**L*(*S*)*T*(*S*). We show that this map extends
to the Thurston compactification of *T*(*S*), and that its boundary values are the natural
antipodal involution relative to *X* on the space of projective measured laminations.

We use this result to study Thurston's grafting coordinates on the space of
^{1} structures on *S*. For each *X* *T*(*S*), we show that the boundary of the space
*P*(*X*) of ^{1} structures on *X* in
the compactification of the grafting coordinates is the graph (*i*_{X}) of the antipodal involution *i*_{X} : *M**L*(*S*)*M**L*(*S*).