humidity and temperature gauge are essential in any growroom. Daytime
conditions should be 70-80 degrees without co2, 80-90 degrees with co2
until the last two weeks when daytime temps should be kept between
70-80 and co2 can be reduced to adjust for the lower metabolism. Night
temperatures should be kept above 60 degrees to prevent stress. It is
preferrable during flowering to have a night temperature drop of 10-20
degrees to stimulate flowering hormones and reduce stem elongation.
I find that low humidity causes stress on plants. I recommend
50-60% humidity until the final 2 weeks of flowering. At this point,
the humidity should be lowered as much as possible to encourage the
plant to seal and protect itself with additional resin. (I am able to
get the humidity to go as low as 31%) I have been able to frost things
up considerably this way. The higher humidity levels prior to final
ripening reduce salt levels within the plant tissue and encourage
healthy, more lush growth.