  I propose that the properties of QCD perturbation theory should be
investigated when the boundary state (`perturbative vacuum') at $t= \pm\infty$
includes gluons. Any boundary state that has an overlap with the true QCD
ground state generates a perturbative series that (when summed to all orders)
is formally exact. Through an analogy with the boundary condition corresponding
to a fermion condensate, I propose an explicit form for a `perturbative gluon
condensate' that suppresses low momentum gluon production, thus generating an
effective mass gap. Standard perturbative calculations are modified only
through a change in the $i\epsilon$ prescription of low momentum $(|\pv| \lsim
\Lambda_{QCD})$ gluon propagators. Gauge invariance is expected to be preserved
since this modification is equivalent to adding on-shell external particles.
Renormalizability is unaffected since only low-momentum propagators are
modified. Due to the asymptotic low momentum gluons boost invariance is not
explicit. Lorentz invariance should be restored in the sum to all orders in
analogy to standard bound state calculations.
