Brad Harris wrote:

Can tomotoes be grown in cold climates in a glass house.
Cold being no lower than 2 degrees C. If I build a glass house or an area
enclosed with glass, will they grow all year??

Not at 2C they even die off fairly quickly in my heated greenhouse at 5C
nominal minimum. That is assuming UK style cold damp foggy winters with a
feeble sun barely making it above the horizon.

I have seen them grown as a perennial once. I think they held a minimum of
15C to do it. Not economic!!

I did notice a curiosity this year in the unheated greenhouse. The last bits
of both datura and tomato plant to survive were those that had grown out
through a vent and were partially exposed to real air frosts. It must toughen
them up a bit to have parts out in the big wide world.

Regards,
Martin Brown