Hey, here's an idea! Why don't some of us plant some well marked, bulb sized and shaped rocks while we're planting various bulbs. In a year or two, we can check back to see where the rocks are in the soil. Perhaps one could glue some wire or cord to the bottoms of some to simulate non-contractile roots. Unless the rocks sprout real roots, this should give us a good baseline of the movement of objects in the soil, something to which to compare the bulbs' movement. Also, there is the as yet unmentioned effects of the plant stem itself, during the growing season. The stem can have a considerable percentage of the weight of the total plant, pressing downward on the bulb. Also, when the wind blows, there is a rocking action produced at the bulb, at least to some degree. Just some thoughts Dave 7A- Tumwater, Washington, where we have now had our summer ... yesterday (sigh)