John & Bob's Optimize Soil Optimizer is a concentrated organic humate soil conditioner that improves poor soil and increases fertility and vitality with organic matter. It begins working as soon as it's added into the soil, and continues to release nutrients and enrich the soil over time. It's easy - all you have to do is spread it on top of your soil. Optimize adds concentrated, fully decomposed organic matter (humus) to create the soil environment for all plants to thrive.