Until I saw Durgan's post about digging sweets I had forgotten that I dug up the five hills here on Sep 23. Fourteen pounds so that makes twenty when adding in the ones from the trellis.
Now... the compost pile behind the house is mainly kitchen scraps with leaves and/or straw layered in there. It is covered with sweet potato vines. Since I have no idea when some throwaway tatie started growing, I think I'll just let it go until just before first frost before tearing the compost pile apart to find out.
