Pinch off the blossoms...that's what I would do first. You can root the stem in a glass of water, changing the water every few days. Some say honey is a great rooting hormone, so try coating the base of the stem in honey before putting it back in the water.

Many of us routinely clone tomato plants by rooting suckers and you'll find many discussions here about how to do it with both suckers and broken growing tips. Just search 'rooting cutting'. There is no loss of production.

But the important point is that it should be done in wet potting mix, not water.

Dave

Either the wet potting mix or just stick it in the ground and water well. I have broken them many times myself and usually just stick it in the ground and they re-root..
JMO,
Tom

Find a sucker growing in between the main stem and a branch..pinch it off and put it in to potting mix and keep it moist..but not wet. It will droop, but will recover.
Bingo. perfect clone.
I had a Olena Ukranian take a hit and so far so good.

Happy Gardening

yep...what they said.

I broke a Cherokee Green off recently when I was moving milk jugs of tomatoes for a plant sale. I stuck the broke top in the pot next to the rest of the plant. It wilted for a couple of day then perked up and is growing like crazy--just found it has put on tomatoes. I will plant both in a container when my hubby gets back into town with some more potting mix.

Peggy