...frame turn red? fertilizer? Is it the fertilizer, acid soil or root bounding? or even a combination? but what is the main reason?some plants are green and others are red...why is that?

Red could be a nutrient deficiency due to the cold ground. Nutrients aren't as available in cold soil.......in time (warnth) itsself around.

When there is nitrogen missing from the soil some plants will be less green and even develop a purple-black tinge or coloration, columbines are particularly prone to this symptom, yet I don't see them looking that way in the early spring or late fall when it is cold, so I don't think that is it. I don't think it has anything to do with acid soil or root binding. For the plants you list is is definitely a symptom of growing in cold weather. On penstemon in early spring the new foliage is always a darker red, so it might even have something to do with short daylength versus speed of growth as these are early spring/summer bloomers, but probably is more of something to do with cell respiration in cold weather.