Just wondering if anyone had tried growing spring onions in the winter (in a greenhouse/ polytunnel) from varieties not specifically labeled as hardy?

I have three varieties - Laser, Eiffel and Red Beard - and I am loathed to buy any more.

I don't have much compost left, but I thought I might sling a few seeds in a pot in the greenhouse (frost free, not less than 4 degrees).

What do you think?