If you look at the 3rd row of maters, that small one has been a test dummy for some high-end fertilizers from Humbolt County, CA. For those that don't know, Humbolt County is the seat of the legal marijuana movement. Many of the best growers in the world are from there and they've developed some of the finest technologies for growing weed, which just so happens, also work very well for tomatoes. I bought some to try and as you can see, it works amazingly well! The plant just to the right of the stunted one, is the same variety and was the same size the day of planting. The difference is amazing.