Folks in frost free zones: What do you do with your plants at the end of the season?

For folks that live in an area that won't freeze your plants, do you still start new plants each yeay? If so, why?

Do you trim them back each year?

Do you just let them keep growing?

I keep all the plants I like and for those that do well/don't die I renew most of the potting mix in early spring for a bit of a boost. Most plants make it through the winter but occasionally you lose a couple depending on how cold the winter is.

I still like to put more seeds down though, both as backups to the existing varieties that I really don't want to lose and for new varieties I'd like to try.

Also, my plants are always outside but are in an area that is unlikely to frost (between my house and the fence and on stones) and gets four hours direct sun daily. I water every few weeks or when the pot feels a bit light to pick up. Prune them back and give them a feed in early spring too

I use the end of the season as a decision making time.  What will I keep, and what will I continue to grow.
 
I have some plants that have been growing continuously for 3 years.  For these, I will need to trim them back, and repot them in new container media.
 
For those varieties that I am less than enchanted with, I prune them back, and dig out about a 1 gallon rootball, and give them away - because I hate to cull a thing that I've grown.  In fact, I was just PM'ing some of the growers in my area to try to offload a bunch of plants.
 
I have a strategy that I've used successfully for several seasons now, also.  That is, I plant in one gallon pots, and bottom water, late in the growing season.  Like around July-August.  I'll let them stay in those pots, and even produce pods, until this time of year, when I free up some old containers, and up plant the 1 gallon plants.  Those plants always do really well, and help give me early pods.

Here in Tucson, I let them grow until new buds begin to break about 6" to a foot above ground (March). Then I cut them back to about a foot. Let them go four years, then replant.

I let them grow, maybe trim them back a little when growth slows into the Summer. Otherwise, the slowest plants are culled and replaced with new plants whenever possible. As long as I have seeds, I have no problem removing slow plants. Summer usually picks the strongest ones for me anyways. If I'm completely getting rid of a variety, I might try cloning a couple of branches before tossing the plant for composting.