  We show how the inclusion of non-perturbative, {\em dynamical} quantum
effects on the evolution of the inflaton can allow for an inflationary phase
that is both consistent with cosmological constraints {\em and} avoids the
problems associated with the so-called swampland conditions. In particular, for
concave potentials such as those preferred by the Planck data, spinodal
instabilities associated with tachyonic masses for long wavelength modes induce
a second round of inflation, which in essence decouples the tree-level
potential from the inflationary phase. We illustrate these points using natural
inflation as an example.
