Brown spots on leaves

[Muarco]

BA few days ago these spots started to appear on the leaves. They are both on higher and lower leaves. The plant is a regular seed from Green House. Grown in Plagron Royal Mix, never gave it any fertiliser. I assume the pH to be between 6 and 7 since tap water is rated at 6.5 pH from the governmental agency that distributes it. I'm waiting for a pH meter to arrive and may take up to a week.

To me it looks like some Boron deficiency and could easily be caused by unbalanced pH but I just want some confirmation. All the other plants in the garden didn't suffer from any of these symptoms.

Also another plant in the garden is showing some deficiency. It's an OG Kush Auto on her 6th week from seed.

She's living in a 7l pot with Atami Bio-Mix and received Plagron Alga Bloom at every irrigation.

 

[TanzanianMagic]

It looks like light bleaching.

One alternative for bright days is to cover the plants with horticultural fleece, which also works for clones, seedlings or plants that have been put outside recently.

 

[Muarco]

It looks like light bleaching.

One alternative for bright days is to cover the plants with horticultural fleece, which also works for clones, seedlings or plants that have been put outside recently.

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She was actually indoor for a while. Can it be the lamp that was too close? But I also noticed the same on the lower leaves so that's why I ruled out light burning.

 

[TanzanianMagic]

Can it be the lamp that was too close?

That's possible too.

What can also happen indoor is that suddenly the humidity drops, which can also lead to bleaching issues.

Whatever causes not enough water or nutrients to reach the leaves to repair them faster than they're broken down.

On the other hand, if you have a water reservoir in your pots, so the plants have constant access to water, they can take a lot of sun and still ask for more, even if there is a heatwave around June 21st, like last year.