[HiPoha]

Peebee, I'm also new at growing tomatillos. The ripe fruit I took seeds from had the husk peeling back, exposing the fruit, and would be the sweetest of the bunch, tasting like honeydew melon. And the seeds look like they can be planted right away. Over in my location, the season is year round, no cold weather to kill the plants.
My best plants were the ones isolated from the ground, placed on my balcony in a 20 gal container. The ones on the ground were eaten by slugs and the surviving ones that gave fruits wilted away from some disease. I planted in May of this year and after harvesting most of the fruits last month, the plants on my balcony has stopped flowering, so I guess the plants have run its course, and maybe the season is over for now for me.