This is my first plant with the Grobo though far from my first ever grow, just not in this machine, so it feels brand new.
Today I noticed that I have what appears to be nute burn on the bottom two fan leaves. I have not adjusted the recipe at all and have made every water change as directed by the app using Distilled water only. When I received my Grobo, we discovered that is shipped with a bad PH sensor as it was only dosing to pure acid, thus I lost my first seed. Grobo replaced the probe and took care of the situation. I only mention this because I am shocked to see the leaf burn and am concerned that the PPM meter may be off…
I also noticed a white speckling on the top of the Coco pod and at first thought I had powdery mildew, but the leaves are not showing signs of that, so maybe this is normal for this type of Coco pod and the Grobo? I attached photos below.
Have any of you had this happen and can you please comment with your thoughts on this. I would hate to loose my second plant.
I removed the two leaves, cleaned the top of the grow plate and sanitized carefully its surface with alcohol, just to be certain I have no bad microbes present there. I did not touch the Coco or plant, except to remove the 2 burned leaves. I also completed a water change, about 12 hours earlier than scheduled, but I wanted the machine to recalibrate its PH and chemicals. I’m thinking about ordering a small fan to place on the bottom to circulate more air (just in case there is PM settling), though that plant is still small.
The genetics are Barney’s Farm Feminized Sweet Tooth. I could not find a recipe for this (they were all Autos and this is not an Auto), so I went with the Generic Indica recipe.
Thank you for your time and thoughts!