I am going to start growing russian comfrey (bocking 14) this year, mainly because I've been reading about how great comfrey concentrate is. The only thing I can't seem to find is what is the best way to store it and how long can it be stored before becoming unusable? I supply some of the local backyard gardeners with compost tea, but the problem is it goes bad fairly quickly after brewing and sometimes the gardeners don't get a chance to use it after they come and get it. Was kind of hoping that comfrey concentrate would have a longer \"shelf life\". Thanks for any information you can offer.
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