Holly Yeatman Cedarwood Specialties Shiitake Log At Home Growing Kit, Fresh Mushrooms, Signed Framed Exclusive
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Green or white fuz spots on the
surface of the log:  This is a green
mold which usually forms on the log
in a commercial growing
environment.  If you see this scrape
it off and spray a very light mixture
of bleach/water all over the log.  
Green mold forms because of too
much humidity, so you may want to
cut back on the watering a little
and take the log out of the tent.