Subject: What happens to a plant in a vaccuum?

When an animal, e.g. a human, is exposed to the vaccuum of space, the animal 
will die. Lack of oxygen is the obvious problem, but also pressure, radiation, 
etc... I imagine lack of CO2 and water would kill a plant, eventually, but is 
the death of a plant in space as fast as the death of a human in space? Aside 
from lack of water and co2, what other problems does a plant encounter? By 
plant here, I mean of significant size, e.g. a Christmas tree, rather than, 
say, plankton.
Thanks.

Re: What happens to a plant in a vaccuum?