Aphids are usually the big problem. If you're lucky enough not to get an infestation, they'll probably make it through the winter fine. If they get aphids, you'll probably have to choose between chemical control or discarding the plants.
The problem you might have had last year was giving them fertilizer. If you use it at all, be sure to use something mild and diluted. Too much fertilizer too early will probably kill them.
I have successfully grown 11 Hungarian Hot Wax plants from seed this year, which are all ripening up nicely on the kitchen windowsill at the moment. I intend to overwinter these at home this year, which I am not worried about. However, for the 2012 season I have bigger ideas...
I currently have viable seeds for 17 varieties (Birds Eye, Bartletts Bonnet, Cherry Red (Ciliegia), Caribbean Hot Blend, Cayenne, Etna, Habanero, Hot Stuff, Lemon Drop, Naga Jolokia, Numex Bailey, Numex Twilight, Peter Pepper, Prairie Fire, Scotch Bonnet, Super Hot Demon F1, Thai) - and may end up buying more before the year's out. I intend to try and grow as many varieties as possible on the allotment just to see what works and what doesn't in this area.
However, provided I have a reasonable amount of success, this will result in rather a lot of plants to overwinter and was wondering if anyone had any experience of overwintering in a heated greenhouse. Is this viable?
Look forward to your comments.
Over-wintering chillies is always a bit hit and miss. The essentials are a minimum temperature of 55° - 60°f (13° - 18° C), as much light as possible and as dry an atmosphere as possible - but just keeping the compost moist.
Its more a case of keeping the plants ticking over rather than growing.
And of course if you're growing Chiltepins (basically wild chillies) you need to over-winter them as fruit in the first year is rare.