Posted: 20/10/2012 at 09:35
Regarding sweet peas becoming leggy, this is only a problem if the seeds are sown too early and are subjected to warmth in the early stages.The golden rule is (as I've said so often) 'don't coddle', they are extremely hardy & (once germinated) will tolerate quite severe frost without protection.
Pinching out is really intended as a method of encouraging them to bush out, rather than a answer to legginess, this is best done when your plants have two or three pairs of leaves.
I would add that the uptake of water during winter is minimal, so keep them on the dry side and water only (if necessary) during frost free weather.
This is how they should look in say February & ready for pinching out: