How do you “sucker” Tomatoes?
If I'm not mistaken I think the indeterminate varieties are better for 'suckering' but the determinates ( e.g. heirlooms) should not be suckered.
There’s always a debate over whether to sucker or not so it’s up to you whether you want to or not. It’s basically pinching off the lower stems to give the plant a more upward growth on the main stem rather than using energy for the bushiness and to keep them from drooping into the dirt. Also, pinch the new little stems/branches that start between the main stem and the major side stems/branches. That may or may not make sense. IOW, you have the main stem and then branches that come off it. In the “Y” where the branches grow out of the main stem little new branches start to grow. Those are the suckers meaning they suck the nutrients from the plant. The claim is determinates need it done but not heirlooms. I’ve never known anyone to do it but whatever rocks your boat.