My pepper plants are turning purple, why is this? 
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Waiting for answer
This plant appears to be suffering from a fungal infection, as indicated by the black spots on the leaves. The most likely cause is excess moisture or poor air circulation, which promotes the growth of mold and fungi. To fix this issue, it is important to address the underlying cause, such as improving drainage or reducing humidity. One possible solution is to provide adequate sunlight and ventilation for the plant. This can be done by moving the pot to a sunnier location or placing it near an open window where air can circulate freely. Another solution is to use a pot with good drainage holes to prevent waterlogging. Additionally, the soil should be well-draining, and the plant should not be overwatered, which can lead to root rot. Watering should be limited to once a week during the growing season, unless the soil is very dry. If these measures do not improve the plant's health, it may be necessary to discard the infected plant and start over with a new one. It's also recommended to keep a close eye on the plant's health and take immediate action if any signs of disease are observed in the future.
Over/under water maybe? Are they heirlooms?