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earth girl · #10 (**permalink**) 01-26-2004, 11:26 PM

Highya, grobros,
According to my best at-hand reference, INDOOR MARIJUANA HORTICULTURE, BY CERVANTES, CLARKE, & ROSENTHAL, c.1993: optimum growth takes place 72-76'F in light, a drop of 15' in dark did not affect the growth rate. Growth all but stops above 90'F and below 60'F in light and below 50'F in dark. Too great a temp drop, and plants become vulnerable to blights/mildews. R/H also plays a part, in that too high moisture content can suffocate foliage in light, and results in excessive condensation in dark(blight/mildew threat). Above 90"F can be tolerated in a system with CO2 suppliment and additional ventilation.
I have found that hairs can turn prematurly red if allowed to grow too close to the light. Also if they catch seltzer water or other liquid topicals overspray, or if bruised, or windburned. Also if fertilized by a sneaky, lowdown, nogood, hermy male flower hiding among the lovely maiden calyxes.
Good luck, grow happy...eg

#10 (permalink) 01-26-2004, 11:26 PM
earth girl Vermicultural Embassy Join Date: Mar 2001 Location: Mojave, CA Posts: 221	More statistics about temp FX on crop Highya, grobros, According to my best at-hand reference, INDOOR MARIJUANA HORTICULTURE, BY CERVANTES, CLARKE, & ROSENTHAL, c.1993: optimum growth takes place 72-76'F in light, a drop of 15' in dark did not affect the growth rate. Growth all but stops above 90'F and below 60'F in light and below 50'F in dark. Too great a temp drop, and plants become vulnerable to blights/mildews. R/H also plays a part, in that too high moisture content can suffocate foliage in light, and results in excessive condensation in dark(blight/mildew threat). Above 90"F can be tolerated in a system with CO2 suppliment and additional ventilation. I have found that hairs can turn prematurly red if allowed to grow too close to the light. Also if they catch seltzer water or other liquid topicals overspray, or if bruised, or windburned. Also if fertilized by a sneaky, lowdown, nogood, hermy male flower hiding among the lovely maiden calyxes. Good luck, grow happy...eg __________________ Promote global worming. It's all about recycling! (Visualize whirled peas...)