Fertilized and Watered

i watered and fertilized on Friday. It was finally hot. The tomatoes and everything else in the back garden are looking good, normal and growing. Everything in the front garden-- the kids is stunted. I did the same thing for both. I planted purple potatoes in the dirt i scraped off the top of the stunted garden and they are doing awesome. I haven't even watered them yet and they are like 3 feet high. Confusing!! I guess the nutrients are tied up in the soil. I guess I add too much.