How long does milorganite take to work on a lawn. Also, it contains a iron, which means when you apply Milorganite it will help grass achieve a beautiful dark green color. After you use this, you may see a little improvement after a few days. Does Milorganite work? Yes, Milorganite works and typically, you can expect visible results in as little as 1-2 weeks. The collected wastewater is filtered to remove all the debris. This is a slow-release fertilizer so you can expect it to remain effective for up to 10 weeks. The color of the grass becomes a little greener. Then, microbes and oxygen are added which will feed on the organic matter in the wastewater. Well, the cat is out of the box now. Milorganite has been recycling sewage into a nutrient rich fertilizer for 90 years. Over-fertilization can result in nutrient runoff into our waterways and waste money, product, and time. lwxij xhasv rvby scxe bziat arjhl xvml rodyzrl lfzxt kmjbxj