In flowering leaves have brown tips and curl

4 weeks in flowering. And leaves are starting to curl up and brown tips, brown dots. But it only happend on 1 of 4 plant in GT. Growing in soil with plagron terra bloom.

Daniel2000 said:

4 weeks in flowering. And leaves are starting to curl up and brown tips, brown dots. But it only happend on 1 of 4 plant in GT. Growing in soil with plagron terra bloom.

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Looks like a calcium deficiency.

It seems to me as light burn...

What have you been feeding them?

And that twine is not a very good thing to use around flowering plants as those fibers can break loose and end up in the buds.

Could be CalMag or Potassium deficiency.... How close is your HPS to the tops of those plant and what's the wattage?? Light/heat stress can cause symptoms that look like deficiencies as well

Them some skinny sativa leaves, what are you growing?