How can fine sandy soil be treated t make it hold more water, ie more "clay like."
Changing Soil Characteristics
If you have a garden bed, amend the soil with several inches of compost/manure and several of peat or coir to a depth of 12 inches. Organic material should be added annually, 1-2 inches total, to replace what breaks down in the soil. Wood mulch decreases evaporation and slowly breaks down and enriches the soil further. (Rich soil has high water retention.) Worms, voles and other diggers and wrigglers work the organic material down into the soil.