Quote Originally Posted by jer001
H=Hydro
C= Cana Coco
T=HydroTent
D = drip system
E = Everyone
E = indoor
E = canna coco
E = Tap Water
E = 6.5 ph
E = 4 months
E = Firtilizer Cal-Mag Plus, Bio-Genesis Synergy, FloraNova Grow
E = 400 Watt metal halide with a sun glo t5 48 on side
E = low 80's
E = 45 - 55 humitidy
E = 24 / 24
E = two oscilating fans and one small intake fan with portable air conditioner outside of tent
Canna coco is great, but only if you are very informed with the product. Let me begin:

Coco, just by it's natural properties, competes for nutrient uptake with the plant. It sounds bad but it's really not. For the most part the only problem you'll have with coco is Calcium uptake; however if you supplement your water with Calmag you will be fine.

In addition to this coco is unlike any other medium. It is neither hydro, soil or soiless. Therefore your feeding won't look like any of those types of grows. Technically you could feed it hydro nutes and probably be fine; however you really want to try to use coco specific nutes. They will ensure that your plant get's all the nutrients it needs without worrying about the coco getting in the way.

PH... Canna Coco naturally buffers itself between 5.2 and 6.2 ph. Coco although is neither hydro, soil or soiless... can be treated like any one of the 3 with hydro being optimal guidelines for this medium. You want to try to water with PH water of 5.5-5.9 ( I feed at 5.7-5.8). However as long as you are within 5.2-6.8 you will be fine in this medium. I had purple stems on my plants when I was watering with ph 6.2. I lowered the PH as the plants got 1-2 weeks older and now my stems and branches are a lovely green.

drip system: While a drip system is actually a pretty good idea with coco.. you can over do it. It's very hard to overwater coco.. I sincerely mean very hard. However if you have your drip system coming on very frequently or on all day long you will create an environment that is oxygen deprived for your plants root system. Your leaves look droopy, this could be for a number of reasons.. one of those reasons being over watering.

Tap water: because Coco is very similar to a hydro system you should try to monitor your PPM reading. There are people who are pushing 2100ppm, but until you get the hang of coco I strongly recommend going no higher than 1000ppm - 1300ppm total.. that is your tap water + nutes + calmag + any other additives you use.

lighting: your lighting appears to be good but I'm curious as to why you're using a MH instead of an HPS when you are 4 months into your plant. Furthermore I'm curious as to why you are running 24 hour lighting. You should be trying to flower. Also how far away are your lights from your plants?

temperature: Photosynthesis is most efficient at around 78 degrees. You lose a considerable amount of efficiency for each degree over that up to 85; at which point photosynthesis DRASTICALLY drops off. Keep your temps in the high 70's, not the low 80's. You probably have several hot spots on your plant that peak above 85. I would not doubt it. Mylar if not laid out correctly will create hot spots.


Ventilation: Your ventilation is backwards. You want to exhaust your air and have a passive intake system. Not the other way around. Your exhaust will naturally draw cool air into your room while at the same time exchanging/exhausting the hot stagnant air. Which may also allow you to move your light closer to your plants. The key is to exhaust the entire room in 5 minutes. Faster is of course better (if you're not running CO2). In a 3x3x6 area. Your 105CFM should be adequate but I've always question the ability for axial fans to be able to exhaust a room faster than the light can build up heat.

Be careful if you do end up moving the light closer though. Temps are, in my opinion, slightly more important than lumens when all things are equal.



Also a side note.. pull your plant out of the pot and inspect the root system. I bet you'd be surprised to find that you are more than likely rootbound. Roots THRIVE in coco; they will consume your medium.. almost becoming your medium entirely. While this isn't necessarily a problem if you have your grow in check and you water more frequently (soil and soiless mediums don't have this benefit.. once you're rootbound you HAVE to transplant) but if your grow is not 100% in check you may want to just go ahead and transplant into a bigger pot. Soil chemistry can become a pain even in Coco with a rootbound plant unless you know what you're doing.

Good luck :thumbsup: