Sowing medium as well as bottom heat seem to make the biggest difference.
Trying to start to early with insufficient bottom heat followed by inappropriate water practices make for most failures and slowest growth.
This year I used an electric propagator for the first time and left the lid on for to long and this held to seedlings back ,Slight leaf scorch.
With hot beds I have never covered the seed trays and have always had better results.
Which leads me to two questions
does everyone using hot beds leave the seed trays uncovered?.
What growing medium do you use?.
As I believe leaf stage is complicated strength of roots must be the starting point.
