I would say the sun is too much for them. I would keep inside plants inside or give them some sun alittle at a time. I would pick days that are not to sunny to start out with . then give it alittle more,then alittle more,ect. If you do stuff alittle at a time you can tell if it is helping or hurting your plant without killing it. Then when you see what works do it next time you grow. Thats just my 2 cents.