We often refer to the liquid that you get out of your worm composter as worm tea but technically it’s leachate – the run off from making your worm casts. Obviously it will have drained through the casts so it’s a great product but technically it’s a bit different to actual worm tea which is made from suspending the worm casts in highly oxygenated water (like when brewing tea. Worm tea - The end result of suspending worm castings in highly oxygenated water (brewing). Every wormery has good and bad microbes. This is ok of course, as long as the good ones outnumber bad. Leachate is made when the excess water seeps down through the worm composter into the collection area. The leachate should be drained regularly and if you are getting more than a few cupfuls a week, the composter is probably too wet! Not only are you feeding the plant, but you increase the number of beneficial microbes in the soil, thus crowding out the bad. It has been proven that the tea, along with the castings, can significantly increase plant growth, as well as crop yields, in the short term (a season) and especially the long term over a period of seasons