spinach and chard doesnt get big in my sfg
I am SFG for the second year and both this year and last I planted both spinach and chard and I just can't get either of them to grow big they just stay small and stunted. I have a mix of vermiculite compost and peat moss as instructed. They are in full sun, the spinach bolts quick but the chard last all summer. They are in a 6 inch depth box. Am I doing something wrong?!