No plants are moved into 3 gallon pots before March. By March the plants stay outside in a couple of cold frames. They are only moved inside when the temperature drops below about 40 degrees. Last year I probably only moved the plants inside about a half dozen times in March. On those nights the plants are in the hall, on the hearth, in the sun room.
As of today, after up potting my first batch of five plants into one gallon pots, my plants take up a total of 6-8 square feet of space. I noticed that one of my Juliet plants has its first cluster of flowers, but they won't start to open for another week or two. BTW, rather than planting one big planting, I plant a succession of small batches of plants. One small batch of about 10 plants gets planted in mid to late December, then another batch gets planted in Mid January, with additional planting about every 3-4 weeks until sometime in April.
When the next batch of plants goes into one gallon pots, the space requirement will start to become a chore and may require as many as six lights, though last year I only used four lights, since the plants were able to spend the days outside some much of February and March. There is really just about a 4-6 week period when the plants may require a good bit of indoor space/time and when they may require daily movement outside and then back inside. We have plenty of space, and the task is not too much of a chore. Only the earliest plants will ever make it into 3 gallon pots, as the rest will go into the ground from 1 gallon pots.
So while this sounds like a major undertaking, it really is not. However by the time late April arrives, I am more than happy to see the plants go into the ground!
Eclectic gardening style, drawing from 45 years of interest and experience. Mostly plant in raised beds and containers primarily using intensive gardening techniques.