I planted these jalapenos about a month ago. I am growing them indoors before I transplant them to my outdoor garden. They've been doing fine until the last day or two, when the leaves have started to turn yellow and even brown. I water them about once a day, maybe a little less often. They are planted in Miracle Gro Seed Starting Planting Mix. I have taken them outside a few times to help them get used to the outside.
Extra info that seems relevant based on the responses I'm getting: I live at an elevation of about 200 feet in the Northern hemisphere, 40 degrees north.
See the pictures below. Please note these are two different plants: