For any tender perennials I've managed to acquire, if it's destined to be killed by winter, I'm taking cuttings or pulling the roots up to add to a pot coming inside. Since abandoning the notion that each plant needs its' own pot, filling pots to capacity allows for infinitely more plants in the same pot-space. This winter, there are about 100 less pots, but at least 150 more kinds of plants, and determining the number of individuals would be impossible. This summer I cut/poked holes in the sides of about 40 hanging pots and it will be a couple years until they are all full of individual plants.
A group of crammed pots:
Trying to use every bit of space a pot has to offer, from surface to side.
I also use winter to do cuttings of hardy perennials. Brugmansia can survive just fine outside for winter, but everything above ground is lost. The thought of every lovely branch succumbing to that is too much for me. Here's a pot with a beautiful thick piece, surrounded by about a dozen cuttings of Rex Begonia vine, which can't survive winter here even at the roots (from what I read.) If that was something I've ever seen before (which I haven't besides this spring when I bought this one,) the concern over saving it might not be so much, but I paid $15 for this one plant, which is at the very upper end for me for one plant that's neither a house plant or hardy perennial. While I was doing this, I thought, this is a good place for the little pot of Tradescantias I'd just gotten, so they went in too. In the spring, I'm going to put this whole thing in the ground near our dog house. The vine can go all over the dog house, the Brug will provide a lot of shade, and the Trad will be a nice ground cover at the base.
Plants don't have to be appropriate bedfellows to winter together in a pot since the light I have available is pretty much the same except right by the windows. Anything not in a spot like that might as well cram together in as few pots as possible. Everything gets repotted in spring anyway, rearrangements for particular preferences while outside for 8-9 months will be made at that time, most stuff put back in the ground for summer vacation!
Wax Begonia with cuttings of Peperomia and Portulaca:
I'm fully involved on both teams! This team ("Blurred Lines!") is where my heart beats faster though. When the successes go back outside in the spring, it's so cool, and way beyond what my budget could provide for an 'annual display.' I think of what I do as blurred lines because I usually only buy tender perennials, not true annuals (which can't be saved regardless of anyone's skill, conditions, luck) and because I've been using a lot of what most people would call house plants as ground plants since it's warm enough for them to be out that way for most of the year. Why should Coleus have all of THAT fun?! This coming summer, I intend to do a LOT more with putting my potted plants in the ground. These Sans multiplied so much, I ended up sharing the extras with almost a dozen people this year!