I think it's your seed starting mix too. I use Miracle Grow seed starting potting mix, by 2 weeks the tomatoes have true leaves, and a second set of true leaves forming. They are transplanted to 3.5" pots at that point, and I use PromixBX, and thry get their first fertilizer, a pinch of Tomato Maker. By 3 weeks they are about 4"tall with thickening stems. I do start mine in late August or early September when it's still hot here. I started seeds in other media that was peat based but called a potting soil, not mix, and the results were stunting growth, even though there was fertilizer used.
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