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.