:smoke: Dede' is right... that's Ca deficiency,... do you have a dedicated Ca-Mg supplement? ...these are best for treating defc.'s, because of their concentration,... Jessy, swing by the Live Help thread if you like, and let us know what supplement you have, or have questions about what to get and how to treat... depending on severity, and if your girl is blooming or not, a combo of soil and foliar application might be the best, fastest solution... post some whole plant pics, so we can see what's up and make recommendations! :thumbs: