Wikipedia suggests the opposite of what I thought:
"When food is abundant a slime mold exists as a single-celled organism. When food is in short supply, many of these single-celled organisms will congregate and start moving as a single body."
http://en.wikipedia.org/wiki/S...
Maybe adding compost or otherwise enriching the soil would help keep them small. But how do you enrich soil on a slope?
Another source said that they became crusty and flaky when dry, but it also said they then "disappeared".
