Why are commercial tomato seedling so thick, strong and have so many branches? Take this image for example:
But on the other hand, most of my plants are super tall and very thin, although they have plenty of space, good light and potted in commerically available potting soil.
Any tips and tricks for how to raise thick and strong tomato seedlings? I make them thicker by cutting the main growth, but not all people do that and still have strong plants.