Howdy F, You sparked my curiosity about "ripen" by GH. I never heard of it before. I did a search on Google and came up with a bit about it. It looks like it is only available in the U.K. They say that it is to speed up the ripening process in the last two weeks of your grow. They say that it is good if you encounter a problem in the last weeks such as mite infestation and you need your crop down quickly. I haven't heard anything about it before, but I would say that it looks like an emergency quick fix, and not something you or I would benefit from unless we had bugs or something. Maybe others can chime in on this one, I don't think it's something we need. How ya' been??