why are my capsicum leaves turning dark purple?

Hi, how do you do irrigation? Nick Murray

there are drain holes near the bottom of the pots, i do a deep watering once the soil gets dry, usually about 4 or 5 days Manejebem | Artur

Hello Nick Murray, I'm supposed to believe that high light intensity could be associated with such damage in tissues. It's clearly visible that the leaves show a burning appearance and I think average room temperature was also high compared to the atmospheric climate.. Right? Secondly, the soil mix and the container look to be inappropriate for the easy growth of pepper. You need to mix some garden soil and sands to make the compost less compact and porous, so aeration takes place to root rhyzophere quickly. If the exit hole does not work, the growing media will be muddy that is very detrimental to root to create suffocation. The impact ultimately caused discoloration of leaves with subsequent wilting appearance. So, I suspect light intensity and inappropriate soil mix. Pls select an earthen pot 10" dia and 8" deep that is appropriate for a pepper plant. Hope that it helps 😊

Sali yes, i think so.

HiiNick Murray I agree with Sali sir It's due to high relative humidity and temperature It caused discoloration of leave