Posted: 05/01/2014 at 16:30
Clarington - This is my personal way (others will have theirs) but I reckon the autumn sown seeds season can be extended to Christmas, with a little additional warmth, say 50C needed for the later ones. After that I would wait until mid-Feb, then sow the seed in a cold greenhouse.....with again a little warmth just to germinate the seed.
After that, just sow your seed in-situ in March.
Once again I would advise not to use heat other than for seed germination.....otherwise the seedlings will just become weak & straggly and no good at all.
Finally, bear in mind that October sown SPs will be over by late August and those sown indoors in Feb or outdoors in March will flower until the first frosts. So, a good plan for maximum flowering, is a mix of sowing times.