Besides the amazing plant growth aspects of worm castings, natural pesticide features are compelling as well. Research done by North Carolina State University found that crops grown with worm castings are much less likely to have pest issues. Many different types of pests will stay away from crops grown with worm castings in the soil.
Natural Pesticide & Fertilizer in One
The regular method of growing many crops involves paying once for fertilizer and then paying a second time for some kind of pesticide so that your crops are actually intact when it's time to harvest. With worm castings, the pesticide is built right into the product and you may not need to invest additional capital in pesticide.
When you add the costs of what you would pay for fertilizer and pesticide together and then compare it to worm castings, the scales start to tip in favor of worm castings in a big way.