Spinach.
We have been eating spinach from the window garden. That patch, pictured below, is quite productive. The spinach I planted in the wagon garden is lagging pitifully behind. This is the box where I found gigantic broccoli roots last year--very little fruit, massive roots! I replenished the soil exactly as I did with the window box, but with these different results. A similar phenomenon is that of my twin grape vines. The north vine is flourishing, the south vine has a single bud giving signs of wanting to burst into leaves.