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the only outwardly detectable sign of my grow op is an exhaust vent in a window. i was wondering if there exists a motion sensor device that will TURN OFF the exhaust fan in the event someone gets too close to the window. this could help avoid detection by curious power company employees or...

What kind of common inexpensive materials could be used as wicks in a wick system hydro setup? There is no hydroponics store in my area so the material would have to be available from a hardware store... or walmart! The 'sea of green' setup will use 5" square pots... each will need about 15" -...

Is it safe to say these plants are all females?

What kind of nutrient deficiency would cause this kind of patchy discoloration?

What does this look like? Heat stress? Nutrient deficiency?

I'm using a flood & drain hydro system with rockwool cubes as the growing medium. What pH should my nutrient solution be to compensate for the high pH of rockwool? Thanks!

I've got a few questions about ebb & flow systems: How many times a day should an ebb & flow table be flooded? How long should the flood last? Does growth stage influence the flood schedule? Thanks!

Please have a look at these 10 seedlings and offer opinions on how they're coming along... they're two weeks old... the strain is AK-47, 50% sativa 50% indica. They have been growing under a 400w MH at a distance of about 20"... I also had side lighting from a cool white fluorescent tube about...

What temperature and humidity levels should I be aiming for with my seedlings? I have 10 tiny sprouts in a propagation tray with a heating pad and humidity dome under a 400w metal halide light. They are only about 48 hours old and I'm wondering how to tweak their growing environment for...