i wouldn't. I dont really see the point. It wouldnt give it that much light. And aluminum foil reflects light in a screwy way cuz it gets kinda crumpled so it would direct sunlight on certain areas and this could burn your plant!!! yes it could fry. I'm not an expert but i'm pretty sure thats what would happen. If your plants are in a place where there is lots of light just fucking leave it alone and let it do it's thing. It will be fine. My plants are in the shade and get minimal direct sunlight but they are doing fine. They dont get the scorching hot direct sunlight but they get the shadier type and they are monsters.