Originally Posted by
jingo
The height recommendations in your screenshot are what I use when I'm growing with my LEDs and they're very powerful. So I bet they're about right. I wouldn't bother with CO2, I've grown some monster plants and had some great yields and never used it especially with coco. The thing to remember with autoflowers is they grow the biggest and the best if they're a little bit hungry, especially the N.
When you are working with Coco, you want to mix your nutrients the most alkaline first and then the least alkaline last. You want to get 10 to 15% runoff every time you water and you want your pH to vary between 5.8 and 6.2 or even 6.3. When I'm mixing up my nutrients if I get them all mixed and at pH is 6.3 I'm happy, same thing as if the pH is 5.8 I'm happy anything in between I'm happy. I do want my pH to vary once in awhile though, so if I'm hitting 6.3 every single time I'm going to lower it a few times. You will need to feed with every watering, anytime you believe you have nutrient deficiencies with a good quality canna nutrient you need to suspect your lights are too low. LED lights will show all kinds of strange deficiencies when they're too close to the plant. They will also usually cause an increase in calcium/magnesium use. you need to be careful and source your calcium and magnesium from the lowest nitrogen source you can find. Or you're going to have to use a nutrient line that'll allow you to reduce your nitrogen by about as much as you add high nitrogen calcium magnesium.
Sounds like you already know that you need more air flow and thinning of your plants. You have to be careful thinning your plants out, it can make them grow a lot faster or it can really hurt a stressed plant. I use defoliation to get bigger yields and bigger plants or sometimes just to slow a plant down a bit. However, it took me a couple years to really learn the defoliation correctly so I wouldn't go for it too much right at the beginning. I would simply clear out some of the leaves that give you trouble with air flow and some of the inner stems little spindly ones reaching out for the light and leave it at that.
You can tag me if you have any specific questions
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