Jacks Prof 77740 Mum Feed Plus Magnesium 22-5-16 Fertilizer, 25-Pound Mums are heavy feeders that respond well to additional magnesium, sulfur and iron The elevated iron levels found in the exclusive feed iron chelate system keeps iron available to the plant even if the pH rises during the crop cycle The additional 2 percent nitrogen in this formula reduces your fertilizer usage by approximately 10 percent Making this product is nutritionally effective and cost effective too Available in 25-pound bag