Thanks everyone for the "river sand" info. I have many more options than I had realized. All the replies were very helpful. Thank you. Karla ******************************************** Karla Chandler Curator of Helen Mattin Warm Temperate Pavilion Brooklyn Botanic Garden 1000 Washington Avenue Brooklyn, NY 11225 phone: 718-623-7200 x 6400 fax: 718-622-7847 http://www.bbg.org/ ********************************************