Compost tea is a liquid that can be collected in the bottom tray of your worm composter. It is full of nutrients, and it can be sprayed onto plants as a sort of fertilizer. The microorganisms from the compost’s nutrients provide protection against garden diseases such as E. Coli and salmonella. It is much better and healthier for plants than some garden chemicals, and most importantly, it promotes the growth of beneficial bacteria, which are necessary to keep soil well-balanced.