Posted: 17/05/2012 at 16:54
Seedlings going leggy is often due to inadequate light. The little things try and reach up to the light source, and if the light only comes from one direction, they lean towards it. Turning the tray/pot daily will minimise the latter. Depending on what seeds you've sown, potting them on deeply, say to the level of the seed, not true, leaves, and improving their light source might help. Is the tray on the floor or raised up? Excess heat can also cause lankiness, so putting them outside during the day (if it's not too vile) and bringing them in for the night for a few days, then they will be hardened off and be able to cope with the big outside world, but do be wary of late frosts, depending on species. And they don't need feeding at this stage either.