I know it sounds really odd but I noticed it during a period when I traveled to island beach locations for several months. The growth was crazy and my hair was such a pretty color I kept getting asked if I dyed it. I've heard before which is the case for me that ppl have more growth in the summer months. For me it's only if I'm outside a lot during the summer. I I noticed in the summers where I was inside a lot there was very little growth.