Honestly I don't know. This one is just an experiment while I learn about growing, I don't have a temp gauge yet. I even won't be able to flower her, if she becomes a she, but I will donate her if that's the situation. I had 1 19W bulb over it and it's about 70 degrees in my room. If it's because of lack of moisture than it's more likely I'm not watering often enough than high heat.