  The intent of this letter is to point out that the accretion of a ghost
condensate by black holes could be extremely efficient. We analyze steady-state
spherically symmetric flows of the ghost fluid in the gravitational field of a
Schwarzschild black hole and calculate the accretion rate. Unlike minimally
coupled scalar field or quintessence, the accretion rate is set not by the
cosmological energy density of the field, but by the energy scale of the ghost
condensate theory. If hydrodynamical flow is established, it could be as high
as tenth of a solar mass per second for 10MeV-scale ghost condensate accreting
onto a stellar-sized black hole, which puts serious constraints on the
parameters of the ghost condensate model.
