IMPORTANT: When seeds germinate, they ought to be faraway from the heating mat. Germinate warm; grow great. You can see how these two varieties of tomatoes hold the similar cotyledons, but as soon as their real leaves emerge, just one seedling has the serrated edges typical of an everyday tomato https://www.wesco.dev/wall/blogs/9498/Grow-Your-Own-Vegetables-Kit-The-Ultimate-Guide-to-Home