This is my overwintering setup.
I use my back bedroom. The windowsill is essentially extended back into the room, with the side panels reflective and the rear panel (remade since original build), with a mirrored finish. The rear panel slides out for watering access. The pots sit on 6mm ply, over a radiator, which is kept low much of the winter but gets turned up a couple of notches as spring approaches, effectively turning the ply base into a heat mat.
With the lights off it's quite gloomy during the day time which for winter suits just fine.
All these orange pots were plants sown last year. I pruned them as required when I brought them inside in mid November (very mild end to last year). Some resprouted in response to that so there is a bit of new growth but no further development in the last 10 weeks or so which is what I want. I don't feed at all during winter and the compost is from last year, so some leaves do go a bit pale but that is normal and reversable later on. I water every 3-4 weeks. Some plants require a further trim when they get repotted late spring ready to go back outside, as some dieback and straggle is inevitable.
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