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Hello this is the first time that I post on the DG fourm. My hobbie is vegetables mainly lettuce,spinach,, radish, any thing that grows pretty quick or for a salad garden. I have been reading and researching, about vermicomposting, I am starting a worm bin hopefully it works. My question is (if all works out) how long do the worm casting keep? Do they go bad , How long before I can use them do I have to dry them out , I'm just not sure, Please help me. any info. will be greatly appreciated. Thanks
jesse, I have four indoor, plastic tubs which can produce as much as 60 gallons/year worth of 'spent media' as I prefer to call the material I remove from the tops of my bins whenever I feed my worms. I think you will find the castings will disappear rather quickly so I wouldn't worry about any loss of potency. There is never enough of this stuff no mater how much you produce.
There is a lot of debate as to what 'pure' castings are, and many ways to harvest these. It would be extremely difficult to make a determination as to weather your castings would loose potency over time, but from a nitrogen standpoint I would think it could last several years since it is mainly organic nitrogen which is released slowly. My guess is you will use it long before that period of time.