November 21, 2016 at 6:05 pm. Searching several academic databases lead to a wealth of evidence that compost teas do in fact provide many benefits, mainly increased disease suppression, increased growth and yields. The disease suppressing ability of foliar CT is well established. How long do worm castings last in soil? Worm castings stay active in the soil for 6 months up to about a year. However, they lose their potency as time goes on, so you should apply new batches every six months or so. Proper storage of worm castings is important. Oct 11, 2022 · Worm tea, also known as black tea, has a long history of stability and popularity due to its unique properties. There are a few ways to make worm tea shelf stable, but the most common way is by using a cold-pressed method. How long does worm castings last in soil?.