posted 10 years ago
You would need very discouraged and traumatized grass for this.
Here is a recipe to discourage grass greatly:
You can cut 2" thick strips with a sod cutter, flip it over, broadcast buckwheat and daikon (and optionally step on them to work the seed in a little better).
To discourage more, remover the sod cutter strips completely and pile them in potato growing mounds, planting the buckwheat in the newly opened ground.