Hi Martha, Since you have "sugar sand" the best improvement you could do would be to add lots of organic material. Compost made of local material is what I would recommend. Some commercial composts may contain materials that could change the pH of the soil in your raised beds. There is a conservation group that is asking people not to buy peat and sphagnum moss because the commercial harvest of them is destroying the peat beds and causing other environmental problems. I can't remember the name of the group. If anyone is familiar with this group, please let the list know. I had no idea that the harvest of peat was causing problems until I read the article in a post to the now defunct Wildgardens list. I don't use peat or sphagnum moss any way. Allen Bastrop Co., SE Central Tx. Wildscape #1071 Zone 8