- Short Bean Fava, aka Bell Bean or Horse Bean
- Austrian Field Peas
- Common Vetch
- Buckwheat
You may have issues with vines winding around the tines on that Universal Gardener Agravator Device™ some people call a rototiller.
A BCS rotary plow chops right through cover crop, rototillers try to make rope or stawstraw bundles.
So basically for timing, small, fragile, green and fresh is good. Matured, fibrous and woody bad.
If it matures out too much, it's sickle time and put it all in the compost heap. The root systems become your manure and the rest becomes compost fodder to reapply by different means.
Scarlet Clover straw is the worst for fouling a rototiller something ferocious. As is ryegrass.