Don't discard those tomato plants after the growing season is over, unless your plants are nearly lifeless and have no remaining fruit or flowers on them. By following some easy steps you can still get tomatoes from plants after summer
Cover tomato plants with a blanket or rug so the frost does not kill the roots of your still producing tomato plants. Cover at night and remove the rug or blanket in the sunny morning.
Water the tomato plants less than usual and only on warmer sunny days. You don't want to freeze the area dirt around the tomato plants you want to get tomatoes from after summer growing has ceased.
When the frost is imminent, dig up plants, being careful not to disturb the dirt around the roots as best you can. Replant indoors. Keep in a sunny area if possible.
Remove as many of the non producing leaves from the tomato plants. This will put all the growing energy into producing more tomatoes from the plants instead of to the leaves.
If you do not have any place to put the repotted plants, remove the plants from the ground and hang upside down in a dark place like a garage so you can still get tomatoes from those plants as they ripen on the vines.
If tomatoes fall from the vines, wrap them in newspaper and store in a cardboard box until ready to use in a few days. You can keep getting tomatoes from your tomato plants long into the fall.
Read more: How to Get tomatoes from plants after summer | eHow.com ehow.com/how_5119057_tomatoes-plants-after-summer.html#ixzz0zj5cCFLX