AnselAdams
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What causes the plant to do that?View attachment 1070289
Good Morning;
I would start by checking and keeping an eye on your ph. Should remain around 6.0 for this stage.
Second i would suspect an early mag def. Check your cal/mag level and balance. Ca should be twice mag.
Here is the guide I use to help me determine what I am seeing.
Plant Doctor - Diagnose Your Cannabis Plants! | Grow Weed Easy
Use our cannabis growing problem pictures and interactive plant doctor tool to quickly diagnose your sick marijuana plants! Click the pictures below to learn about a marijuana problem, deficiency or symptom & get the solution! Still having trouble? Consult our 5-Step Remedy to 99% of Cannabis...
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In particular I would take a look at this one:
How to fix Cannabis Magnesium Deficiency (Mg) Pics & Symptoms
Does your cannabis plant have yellowing lower leaves between the veins? See pictures of a magnesium deficiency and learn the easy solution.
www.growweedeasy.com
Cannabis pH Management - How to adjust pH in Water and Soil
Brown spots appearing on your lower leaves? See what cannabis leaves look like as a result of pH fluctuations and learn the solution!
www.growweedeasy.com
Happy Growing