Brown leaves

It is hard to tell. This looks like either too much nitrogen or some sort of blight. I would treat for both...

Epsom salt flush and copper fungicide (Bonide)

stop feeding if you are for a bit

after they dry from the flush give them water only at least for a week...maybe more depending on what you are using for soil
 
I'd say phosphorus deficiency considering you are in first or second week of flowering, but I need to know what's in your soil mix.
 
cannabis_leaf-deficiencies3121.jpg


good thing to have for general ideas. just a quick look and see chart
 
Let me clarify

Too much nitrogen will cause nutrient lockouts. This will show as a nutrient deficiency. Don't let that fool you and give it more because it can't take it up anyway. The Epsom flush will allow the plant to start taking up the nutrients that were locked out thus eliminating the deficiency.
 
buck shot, could you put the info for the epsom flush in my grower's bible please? a how to flush thing would be awesome

as per

Doc Bud


" There's an easy way to get rid of excess nitrogen in soil.

Epsom salt foliar flush coupled with an epsom salt drench.

For the foliar, mix up about 400ppm of Epsom Salt and RO water.
For the Drench, again, 400ppm and run at least twice the volume of water as soil through pot. This can take a while."
 
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