[Richard Butler]

Hi,
My cobra climbing beans have come up in the greenhouse and are about 4inches tall. Today noticed some of the leaves curling and limp. They are watered and have been protected at night with fleece, any ideas?

[New shoot]

It does sound like cold damage, but they can also scorch in direct sunlight.  We have had hot sunny days, but some chilly nights where I am.

Where are you based and is the greenhouse heated?  Fleece might not have been enough.  If you can put a picture on, that would help people to give advice as well 

[Goosegirl]

Could you have over-watered them as they are only small and don't need a lot of water at this time.

[JimB]

.
I find them very tempremental early in the season, so I am never in a hurry to sow them, I rely on the dwarf sorts at first, less bother.

And yes they do hate to be overwatered in the seed pots.