Black Spots

[Swing420]

First time home grower here. They boys have been growing nice for the last month and a half. Couple days ago one leaf started going this. Can anyone help me out and tell me what’s wrong?

 

[Vagician]

Most likely phosphorus. Not too far along yet though.

 

[Swing420]

Most likely phosphorus. Not too far along yet though.

What’s the cure?

 

[Vagician]

Sorry, I should have said phosphorus deficiency, not just phosphorus. What nutrient line are you using? Check Mulder's chart to see if there are any other nutrients possibly causing negative interactions before simply increasing your phosphorus.

Mulder's Chart

How can you use soil test results? You could ask Mulder. We have learned a lot about plant and soil science in recent decades, but there is a chart that gives us some insight into how the minerals...

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