Yellow spots. Does anyone know what this is???

splicendice · Feb 19, 2019

Hey everyone,

I started noticing tiny yellow spots on my 35 day old plants. I cut out the affected leaves and I'm posting pictures of them here. Any help with diagnosing them is greatly appreciated!

AgentPothead · Feb 19, 2019

To me that looks like the start of a calcium deficiency. Are you in soil or hydro? Are you keeping track of PH? I think calcium can get locked out below 6.2 or so?

splicendice · Feb 19, 2019

I'm in coco, pH at 5.7. Nutrients as per Canna Coco grow guide.

Douglas.Curtis · Feb 19, 2019

Welcome to ICMag!!

Yes, I would also say calcium.

AgentPothead · Feb 19, 2019

splicendice said:
I'm in coco, pH at 5.7. Nutrients as per Canna Coco grow guide.

I don't think calcium gets locked out in hydro till 5.4 or 5.5? So you are safely above that. I guess you might could let it swing up a tiny bit, about 6.2 or so see if that helps. I think when I ran coco I was flipping letting it ph to anything between 5.8 and 6.2. You can also supplement with some calimag or whatever brand liquid calcium/magnesium fertilizer you can get your hands on.

soil margin · Feb 19, 2019

Yeah I seem to have calcium issues more frequently in coco mixes than I did when running soil mixes. Oftentimes it seems to affect smaller plants and they will grow out of it once establishing themselves a bit more.

AgentPothead · Feb 19, 2019

My tap water comes out ~60ppm so I had to add calimag when I was doing coco.

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Yellow spots. Does anyone know what this is???

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