Posted: 08/04/2014 at 19:27
Hi, Snowdrop....here goes.
1) I wouldn't advise sweet peas being in a propagator at any time.
2) Dwarf (hanging basket) varieties don't need pinching out.
3) Best results are from seed sown in deep pots, where they should remain until being planted out...hence avoiding root disturbance (which they don't like) when potting-on.
4) It would seem that yours may be a little soft from over protection, so for a week put them outside during the day & bring them back indoors at night......then plant them out where they are to flower. Before that pinch-out the growing tips of those 10-15cm ones.
Not sure if you spotted on previous pages, but I did say that germination usually takes between 7 to 21 days...so you seen to be on course for that, although it can take longer depending on temperatures.