Why Aren't My Tomatoes Turning Red? 7 Possible Reasons
What Makes Tomatoes Turn Red? Lycopene is the pigment responsible for the orange and red colors in fruits like apples and tomatoes. Temperatures consistently below 60 degrees F. also inhibit ripening. ArtMarie / Getty Images Fruits that are fully mature and have a slight blush can be harvested andbrought indoors to finish ripening. They do not need to sit in a sunny window as long as the correct temperature is provided....