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To me it wasn't really a good indicator, but it was kind of a fun thing to do just to see if it would fern.
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My thoughts exactly! I would get really nice ferns around o time, but I also got them around af time. I did it first thing in the a.m., before eating or anything. Often I'd forget all about it and check it hours later.
So I guess I like using it along with the cm and cp and temping, just to have another indicator to add in to the mix.