Depends on the year. Most springs it helps pull moisture out of the ground and dry things out enough to plant. In that case I plant into it green and kill it between planting and emergence. If it's an unusually dry spring with no rain in the forecast, I'll kill it a little earlier to conserve soil moisture until I can get the beans planted.

I don't do anything as far as rolling it down or anything like that. I like it standing upright as much as possible when I plant so there's less residue for the drill to cut through. It starts falling down on its own after a month or so and makes a great mulch for the rest of the season.