I have a packet of leek seeds here (musselbrough) that say "sow directly in your garden" on the cover, from Feb-April.
Reading the small print however it suggests planting them "in warm moist soil" 1/2" apart, in rows 12" apart, and then transplanting them to "final site" (at unspecified date) to grow to maturity.
Am a bit confused about this. The soil is not warm at this time of the year! And if you are planting directly in the ground, why bother moving them? Why not just start them off in a greenhouse or coldframe? Or is the advice to start them off in one place because they need to be covered at first, and it saves space?