WOW, that's a lot of questions :) But that's no problem, and I'll do my best to answer.
The pot size is for a couple of reasons. First, and foremost it's what I had lying around. Second reason is limited space indoors. When we visited a commercial green house at Chena Hot Springs we saw they were using 2gal pots. Also, they were also growing 2 plants per pot to increase plant density in their green house. They kept their plants small, and grow them as annuals. I let my plants get larger, though I still keep them trimmed so as to better utilize the limited room in front of my south facing picture window.
Last reason for the 2gal pot size, I can fit 2 in a Sterilite under bed storage container. The Sterilite containers make for a nice containment system to keep any spills or mess off the wood flooring. They also have held up well to the UV's, and have lasted for many years of use.
As far as preserving your harvest, peppers freeze well. We've also made lots of pepper relish, both sweet, and hot. The easiest method IMO is to dehydrate. I dry a lot of my peppers, some smoked, some not. From there you can store them whole, or you can grind them into chili powder. Stored in a sealed bag, or container they will last for years like this.
Why we grow them as perennials... I enjoy getting the occasional peppers they put out during the winter months. I also like that my house plants are more then just decoration. They sit alongside our indoor herb garden, and we enjoy having a bit of greenery to look at when the rest of our world looks like a black and white photo during the long winters.
We absolutely save seeds, and to date have never had a problem with cross pollination, or have we noticed any genetic drift with the few hybrids we grow. Just try and let a few peppers reach full maturity, and use those to fill your seed bank. Also, make sure you let them dry well before storing them. Even though we save seeds, we still enjoy the load a bowl, and bust out the seed catalog method. It's always fun to try something new.
I think I got everything, if not ask again :)
Edited by Juthro, 20 January 2022 - 03:49 PM.