But the L4 and L5 positions for the Earth-Moon system are much closer, exactly 1 lunar distance away. Because the space station would orbit the earth it would eclipse the sun once per month. However some quick calculations show that the eclipse would last a bit less than 3.5 hours. I think whatever plants are growing could survive. And if it happens during the normal "nighttime" growth & transpiration period it would make absolutely no difference.

If the space station is designed with a Habitat Sphere like that of my design a false-surface could be used to prevent any harmful temperature changes.