Answer: It could be either one, or possibly a nutrient deficiency. You might try watering it more deeply but less often as this encourages the roots to grow deeper to where the soil stays more evenly moist and will be better able to support the plant is it grows larger and fruits and is exposed to more hot weather. The goal is to keep the soil evenly moist but not sopping wet. A layer of several inches of organic mulch can help with this. Then check with your finger to see if you need to water or not. You might also give it a side dressing of compost and a foliar application of a seaweed based fertilizer and/or a complete fertilizer with micronutrients according to the label instructions and see if that makes a difference in the foliage color..
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