the cover crop most ppl forget about

It's that weird time of year where half my garden still says summer! and the other half is fully in fall mode. Tomatoes and cucumbers are still hanging on despite a couple of recent frosts, while peas and lettuce are loving the cooler weather. I'm guessing I have two or three more weeks before I need to pull all my warm-weather crops out, and once that happens, cover crops will be going in to replace them. It's rare that any bed in my garden stays empty for more than a few weeks, even in...