Gypsum Powder
Organic Gypsum Powder 5LB - Made in USA - Calcium Sulfate Dihydrate - s, Plants, Mushroom Cultivation. Calcium & Sulfur. Cures Blossom End Rot. OMRI Listed. 4.7 out of 5 stars. 324. 200+ bought in past month. $17.77 $ 17. 77 ($0.22 $0.22 /Ounce)