If it’s drier, simply spritz with a spray bottle or fine-mist from a hose and mix until the squeeze test succeeds. To take the guesswork out, I would suggest investing in a moisture meter. I wouldn’t store longer than 6 months, certainly no longer than a year and always keeping tabs on the moisture content.Click to see full answer. Regarding this, what is the shelf life of worm castings?Worm castings can last up to 6 months – and sometimes longer – depending on the method of storage.Also, how much worm castings should I use? If you’re starting from scratch, one of the best ways to apply worm castings is to mix it in with the soil. This works great if you’re planting in a raised bed or some kind of a planter where you’re filling the whole thing with soil anyway. For this, using a ratio of 1 part castings to 2 to 4 parts soil works best. Hereof, do worm castings go bad? Worm castings do have some nitrogen in them. While it is possible, we’ve never heard of anyone letting their worm castings go bad before. We’ve heard of people keeping them stored for a year or two and then using them with great results.What are the disadvantages of vermicomposting? The Disadvantages of Vermicompost Ratios Between Waste and Time. Vermicomposting requires waste to be applied in thin layers because of temperature concerns. Temperature Limits. Vermicomposting requires a low temperature to be maintained in the compost operation so the worms do not lose moisture and dry out. Care. Cost. Size Scales. Concerns.