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what's wrong with these leaves? is it mold ?

Texasautoflowers
Texasautoflowersstarted grow question 4 months ago
Growing 5 autos in 5 gallon bags, roots organic soil, week 4. All 5 different strains, only the blueberry is having these weird leaf issues. Is it nutrients or a mold?
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AsNoriu
AsNoriuanswered grow question 4 months ago
Calcium, but looks more like all leaves, who touches verge of pot, could be mechanical damage . If any rusty spots appears on other leaves - calmag to the rescue !
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m0use
m0useanswered grow question 4 months ago
Does not look like mold. maybe could be some issues with Calcium or Phosphorous or even PH in the medium messing with the roots.
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