In the course of planning your garden, you may decide that you would like to locate some coarse horticultural vermiculite. While you may not be able to find it in big-box stores as of February 2010, you can still order it from garden supply specialists. It can also be obtained from some farm supply stores, or via several suppliers on the Internet. You should be aware that there is some controversial history regarding this product, however, and you may wish to research further before deciding that coarse horticultural vermiculite is right for your project.
Visit your local garden supply center to see if it stocks coarse horticultural vermiculite. If they do not, ask if they can place a special order for it.
Visit your local farm supply store to see if they stock it. If they do, it will likely be in a very large amount. Make sure you can fit a 25-pound or larger bag in your vehicle before proceeding.
Check online farm vendors, such as Home Harvest Garden Supply and 7 Springs Farm Catalog. These are only suggestions--if you have a favorite online farm catalog, check to see if it carries this product or can order it for you.