Posted: 01/09/2014 at 21:18
I find it is best to start bell peppers in February in a heated propagator on the South facing kitchen windowsill in good sowing quality compost. When they are 5 or 6 cm tall (and have a couple of true leaves) I pot them up into 10cm pots and put them in my greenhouse that has a frost buster, though you could just keep them in the house on a sunny windowsill.
Then they need potting up into big pots when they have grown a bit more and at that stage, possibly April they will need a greenhouse, (you could use a cheap plastic one) for the light, and if there is still frost at night they will need either a heater or to be brought indoors overnight and then out in the greenhouse again the next morning. I know it sounds a bit of a faff, but it is worth it. At the moment I am waiting for the peppers to turn red, some of them have and then I know that it is worth it