Here in southwest Boise, used to be timber cutting country but that's much reduced now, we get a product called "soil-aid" that is really composted sawdust. A friend planned a large dinner party but didn't want to bother with a heavy bag of sand for her luminarias. She had a yard of soil aid on hand,so filled little paper bags with soil aid, stuck a candle in each one, and just before guests were to arrive, she lit the candles. Guests arrived, confronted by a conflagration, parallel walls of flame on either side of the sidewalk. It badly burned the lawn, too. To this day she mutters about her flaming luminarias. Margaret L