Good morning!
This is my first time posting on Reddit, also my first time growing my own marijuana. I’ve come here hoping to find answered from some seasoned growers!
I’m not sure what all information you’ll need to help diagnose what might be happening with my plants.
It is a 4 site Ebb and Flow set up as you can see. The medium is 100% coco (I changed the very stunted plant (lemon pie auto) to 30/70 coco and perlite 10 hours ago hoping better drainage will help). The LED lights have been on 16/8 @ 60% intensity (since repotting 10 hours ago I have moved them back to 12/12 to reduce stress on the transplanted one). They are watered at lights on for 15 minutes and drained. Temp circles around 72F with a humidifier set on 65% rh.
I’m using Foop Nutes at the recommended amount (minus 25% for it being a hydro garden as instructed).
Yesterday, 3/28, I added cal mag after reading some posts on here.
I rinsed the plants/pots and cleaned the system before dosing 3% hydrogen peroxide @ 10ml per gallon in the res twice in the last 7 days (there was a strong fish smell and brown sludge in the bottom of the res). The res also has a circulator pump that makes a waterfall inside the res and I must say it is frothy!
Before the hydrogen peroxide , I was constantly dealing with ph dropping from 6.2 to 5’s. Now, since cal mag and hydrogen peroxide I’ve seen the ph spiking UP to low 7’s. I always brought it back to 6.2 daily though. After buying cal mag yesterday, and speaking with our local gardening shop, I’ve now adjusted the ph to 6.5.
The temp in the 15 gal of rez water is 64F.
I have 4 plants, only 2 are showing signs of something being off, I provided pictures of them all though.
Thanks!
by rdo51090
2 Comments
When I have grown with coco I mixed 50/50 with perlite.
Are all of your plants autos? Autos are commonly smaller/more compact than photos so comparing them is not exactly apples:apples if the others are photos.
12/12 light cycle will signal non-autoflowers (photos) to flower so you don’t want that. Light stress is not a thing, rather the light determines how much of everything else the plant needs (co2, nutes, water, etc.) Here is a scientific explanation if you are interested: https://www.youtube.com/watch?v=ID9rE5JewVg&t=1597s
Having sludge / froth in your rez is definitely not good/right. I’m not familiar with Foop nutes but a quick google search lead me to some organic ones, not sure if anything extra needs to be done with organics to prevent that, i use synthetic only (master blend).
Here is a scientific video on nute deficiencies: https://www.youtube.com/watch?v=ZTE-YCNWC8s – Going from this videos examples, I would say your pictures show Magnesium defencies, which is likely caused by your low PH explained here: https://www.youtube.com/watch?v=GryVKpn8nAM. In this video – https://www.youtube.com/watch?v=FII4RII52yw&t=33s – he suggests aiming for 6.5 PH. It’s pretty crucial to maintain a stable PH so check it daily.