Compost Tea - One Time Pickup Compost tea is a concentrated soil “pro-biotic” to increase soil health by introducing beneficial microrganisms which also nourishes plants. Many gardeners struggle with poor soil as a barrier to having a more productive growing space, and by making compost tea available to the community, we will help people grow more food and nutrient dense food while using the funds it generates to help bolster and expand our composting program at GrassRoots Garden.