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    Commercial growers' height from canopy to light

    Hey guys, I have seen several commercial growers on the web & social networks who have lights raised pretty high. Easily 5-7 feet above canopy level. For example: http://www.cannabisbusinesstimes.com/FileUploads/media/merryjane083116.jpg This seems like it goes against the basic principle of...
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    LED Nitrogen toxicity?

    Hey guys, Ran into a strange new issue with my recent harvest and wanted to see if anyone else here had an experience like this. My current room is half HPS half LED (non-CoB, old school 600w (300w draw) purple LED lights). Starting from about half-way through bloom the plants under my LED...
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    LED lighting in an open space VS tent

    Hey guys, I'd like to give LED lights a shot. The HPS heat is a real issue for me. That AC makes the power bill crazy high!! One of my primary concerns is that I would be growing in a fairly large area that currently houses 3 1000W HPS bulbs. There are no reflectors on walls. Even if I put up...
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    Reintroducing Nitrogen in Late Bloom?

    Wanted to see if any of you had ever had to reintroduce N in late bloom (weeks 6-7) and if it had any negative consequences. I believe I screwed up by testing shutting down N early in flower. Clearly my current strain needs N at least for the first 4 weeks of bloom (I know this now). Most of my...
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    What is the optimal # of 4" rockwool cubes on a rockwool slab?

    Hey folks, For those who may have taken the above approach (4" rockwool cubes on rockwool slabs), how many plants would you recommend be placed in the slab - 3 or 4? I see most setups use either 3 or 4, and I'd love to know if having up to 4 plants will leave enough space for the roots to...
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    Bud Blood / MoaB VS late-stage PK boosters?

    Hey all, Forgive me if this is a newbie question :) Why not use something like KoolBloom powder instead of Bud Blood/MoaB in the first 2 weeks of flower? The products are both high in PK - so what is the difference? Ingredients: BudBlood: Potassium sulfate, potassium phosphate and magnesium...
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    Late-bloom period - PPM vs Suggested Dosages

    Hey folks, wanted to pick your brains on the following dilemma I'm facing in second half of bloom. When I mix in most of my nutes at recommended dosages (not even conservative), the solutions ends up being around 900 PPMs. This is well short of the recommended 1200PPMs a lot of growers target at...
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    Algae prevention alternative to coco covers?

    The coco covers are pretty pricey at over $1 apiece. Anyone use any alternatives? This would be for hand-watering rockwool, so the water does need to make its way through the cover..
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    Air Cooled Hoods for Temp Control

    Hey guys, I'm looking for people who have experience with having lights without air-cooled hoods AND without them. How big of a difference do air cooled hoods make for overall temperature of the room? Is it nominal or significant?
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    Best Supplement For Yield In Final 3 Weeks

    You can only choose one (in addition to regular feed you've been using like such as CalMag and FloraBloom). What is it? Overdrive? PK13/14? One of dozens of others? Name 'em and tell us why :)
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    Kelp Meal application?

    Hey guys, I've been reading about benefits of Kelp Meal, and I'd love to give it a try, but I have no idea where to start. 1) What kind of Kelp Meal do I buy? There seems to be several brands but from what I understand they're not all the same (dried = bad because it removes most of the good...
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    Sunshine #4 - soil or soilless?

    Is this medium (the black bale, not yellow bale) considered soil or soilless? It naturally keeps more acidic (per the manufacturer) and I have no idea if I should be using higher or lower ph when watering it. Thanks!
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    Inadequate flushing?

    Hey all, I tried flushing for the first time but I think I didn't do enough of it. I only let about 10-20% runoff and I just saw that people recommend putting in 3x the amount of water as the pot holds which probably leads to a lot more runoff. Is this bad? What are some issues I may face? I...
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    Heat Stress + Slow Water Absorption + Discolored / Blotches on Leafs

    Hi guys, Got several issues plaguing plants in veg (half-way through the 18/6 cycle). The plants are in large pots, the medium is Sunshine #4 mix, watering with RO water. The good: - No drooping of leaves - Temp (78 F) & humidity (~50%) all within proper range - Vertical plant growth rate...
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    pH + PPM meters?

    What are you guys using to measure your pH & ppm levels? BlueLab and Hannah are expensive brands but seem to be more reliable/accurate. Things like ATC (automatic temperature compensation) and accuracy are intricacies that worry me about the cheaper products (the $20-$25 pens you can find on...
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