On freezing temps, I am a coward. I don't like it cold and don't want to lose my citrus so I am probably overprotective and don't take a chance myself. lol
Now on fertilizer? I'm lazy. I should fertilize everything more than I do but I'm always in a hurry and the plants need water and I don't think about it. I'd keep some mixed up but have kitties & dogs that follow me around and drink out of the plant water so try to be careful for them.
Perhaps you can help by reminding me when I need to!?!!