Originally Posted by Fusion_power

Promix BX (M) is hard to beat. The only caveat is that it needs a tiny bit more fertilizer to grow good tomato seedlings. I add 1/2 teaspoon of a complete fertilizer with micronutrients per tray of 48 plants when the plants are about 3 to 4 inches tall.


I would add that every seed start mix I have ever tried needed a bit more fertilizer to get large healthy seedlings.