Update. Checked on the Sago status this past weekend. It's been a little over one month since planting. I now have sago growing tall enough to be floating on the surface and flowering. I dug a few plants up close to shore and find they are rooting well. The roots are going down 6 to 10 inches. I think this is going to be a success unless our current dry weather continues. This pond is down over 2 feet from the spring high and only had 4 feet of water at the deepest. In a way this has been a blessing in that the water has not cleared up as much as I had hoped so my concerns about light penetration were unfounded given that my depth has been cut in half. If things stay dry for too long some of my plants will be on dry land. That won't be good. I need rain.
