Posted: 30/03/2014 at 10:16
Hi little bee, I agree with the above. It's important to remove the tops of propagator trays as soon as the seeds have germinated. What I do is sow the seeds into the tray, water once from the bottom - as soon as the top of the compost starts to change colour they have had enough. Put the top on and do no more watering until the seedlings show, then remove the top. After that, water when the compost starts to dry out - I judge that by lifting the tray and feeling how heavy it is.
Carrots need direct sowing into their final growing position - they won't transplant well and even if they do survive being pricked-out, they will produce poor roots. When carrot seedlings germinate, they send down a very thin but very long single root. This becomes the carrot and it is virtually impossible to transplant them without damaging this root which can become 15cm long in a matter of days after germination.