Local Farm Stores: These are your best sources for bulk fertilizers, as you won’t have to pay shipping. Although materials may not be carried in stock, they can perhaps be special ordered. Feathermeal and soybean meal are listed under feed rather than under fertilizers. Try searching on “Feed” or “Farm Supply” in your area. Materials usually come in 50 lb bags.
Alpha Chemicals, Missouri, http://alphachemicals.com/
Small quantities of most sulfates. Internet only.
Peaceful Valley Farm Supply, Grass Valley, CA www.groworganic.com
Black Lake Organics, Olympia, WA http://www.blacklakeorganic.com/
Seven Springs Farm, Floyd County, VA http://www.7springsfarm.com/
Concentrates, Portland, Oregon http://www.concentratesnw.com/
We carry many natural/organic custom fertilizer blends, and we can have custom blends made to your specs or our recommendations in 1 ton lots or more, in bulk totes or bagged. email@example.com
Grow Organic, Hood River, OR http://groworganics.org/ (no shipping)
Keep It Simple, Inc., Redmond, WA
www.kisorganics.com for online orders
1-425-558-0990. Small quantities of minerals. Potting soil & more.
Where to find minerals in Canada: