[BitWielder1]

... growing the plants in the near-vacuum at the Martian surface.

You would have to compress the air until the plants can survive in it.
Everything living on Mars will need airtight housing for the next several centuries at least.
There is plenty of sunlight since the atmosphere is so thin, outside the greenhouse.
If you need even more sunlight, use mirrors.

[rightwingcrazy]

http://www.planetary.org/blogs/guest-blogs/20120515-earth-life-survive-mars.html

Lichen, cyanobacteria, water bears. They’re tough.

[PIF]

It isn’t just light but how much UV and IR the plants get; on Mars those components are a lot weaker than on Earth, and mirrors will not help.