On 17 Oct 2009 12:46:35 GMT, wrote:

The old advice foe the home gardener is to cut off the stems above the
top truss of green tomatoes i Sept. to direct the energy to the last
fruit , but if you make green tomato chutney the why bother.
If you heated the greenhouse you are growing them in then you could
carry on croping them.

I didn't think it was the heat so much as the sunshine that turned them
red, so once you got to the shorter days, they would stop ripening.

I think you'll find that heat does the trick rather than sunlight.

In Spain for example, they usually grow toms on rows of "tepees" ,
deliberately so that the trusses dangle down inside the rows and get
very little direct sunlight.

And, of course, picked toms ripen very well in dark drawers.

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