Also, you should see the size of the vegetables that grow near the poles where they have short summers but very long days,
Some of them don't mind that much, actually. There have even been experiments growing plants with 2 weeks of light followed by 2 weeks of darkness, as on the moon. It can work if the 2 weeks of darkness are also at lowered temperature, which is easy to achieve in the absence of sunlight.
The exotic species of plant used in the experiment? The pea.
Venusian colonisation will have to be sub-surface, even if we cover it in water - at least until if and when we come up with a gigantic solar shield that can filter and weaken a planet's worth of sunlight.
Venusian colonization will probably be high up in the atmosphere, where temperatures and pressures are often going to be around the same as in San Francisco.
http://en.wikipedia.org/wiki/Colonization_of_Venus#Aerostat_...