Imp, for "Greasy" type beans you pick the bean at the height of fullness, in other words when you can see the seed in the pod; and they are nice and plump. This is the opposite of regular commercial grade beans. Also, greasy type and cornfield beans have to be "Unzipped" or strung before snapping and cooking. Which cut short are you planting? I'm growing multiple greasy and Cornfield types this year; SC Red Stick, Cherokee, Tobacco Worm, Fatman, GreasyBack, Turkey Craw and NC long greasy. Hopefully I can find a way to squeeze in some Caseknife; but the seeds and planting space are running pretty scarce this year.
http://www.heirlooms.org/store/c16/G...ut-Shorts.html