Posted: 03/04/2013 at 23:23
Cosmos are one of the most reliable germinating seeds and also incredibly quick to come up. I grow lots and lots and lots of white ones, never coloured ones. I haven't planted my seeds yet, there' still time for this super plant. As they are a relatvely large seed I now grow them in modular trays one per module. This way you don't check them as much if you pot on. Also if you grow in normal trays they are so quick to get going that ofen the roots are matted together before you blinkand I end up literally tearing them apart as you can't distinguish what roots belong to which plant.
I agree that if you have plants now keep pinching out for best results.