In many ways, worm tea can work just as well as pure vermicast. However, there are some situations where it’s better to have pure worm castings.
Worm tea is a liquid that’s made from brewing worm castings in water. The nice thing about it is that you get a big variety of microbes in the liquid, which can be sprayed on the soil or directly on the plant.
This is extremely beneficial for boosting plant nutrition. You can get the microbes in a high concentration liquid that can help cover the plants in the good stuff. On the downside, using worm tea doesn’t provide you with the same benefits as putting worm castings in the soil when you plant. You won’t get the benefits of aeration or moisture control by using worm tea.
You also have to reapply the worm tea every few weeks to two months for best results. The big advantage of using worm tea is that it makes the microbes go a lot farther with this method. You can spray an entire yard with a few gallons of worm tea. On our own gardens, we spray it every few weeks to keep the aphids and other bugs at bay