just reading an older book and it recommends planting two seeds per hole in heavy soil so that one sprout can help make way for the other.
since i know of at least one other person here who likes growing lima beans in heavy soil i though i'd pass along that tidbit. :)
here we don't seem to have the problem mentioned that the beans can't break through the soil. perhaps i plant them a bit more shallow or the extra sand and organic matter i keep adding to the gardens is doing it's job...
songbird