putting sweetcorn in the greenhouse

Bearing in mind that my greenhouse is in Devon...
I germinated mine in the 'den' and put them out in an unheated greenhouse about 3 weeks ago - they are doing fine (and have even had a few additional ones germinate since I put them out there)
I would imagine that unless temperatures really take a turn for the worse you should be ok now - believe that they grow best at 14-15 degrees celsius or higher.
I'm trying to wait another couple of weeks before planting them out on the plot - but I've got space issues in the greenhouse now...
Anyhow - good luck with 'em. 

Balders

What are the temperatures like at night in the North east, Chickpeacurry?

If they fall much below 10C In your unheated greenhouse,  you might find that your sweetcorn plants find it a bit chilly still

It fell to just above zero in mine on Monday

  I sowed mine in my unheated greenhouse in the middle of march they are have steadily been growing and now are about 3-4 inches high

What are the temperatures like at night in the North east, Chickpeacurry?

If they fall much below 10C In your unheated greenhouse,  you might find that your sweetcorn plants find it a bit chilly still

It fell to just above zero in mine on Monday

That's why I say to get a max/min thermometer - so you have some idea of what's going on with night time temperatures in your greenhouse