Peat or peat moss is way too acidic - rather than trying to counter that with lime, I'd suggest using coco or vermiculite. Peat is usually added to acidify the soil - and cannabis is one of a few plants (e.g. asparagus) that does better in a slightly alkaline mix.

Scared
ScaredasHell Reviewed by ScaredasHell on . Need help Hi everyone, Need help. Some redish rust color spots have appeared on a few leaves of two of my plants during flowering. The spots aren't ,really, going crazy but definitly spreading when they show on a leaf? Checked k-def? and trying to apply a mild n-p-k but am unsure if the spots and yellowing aren't normal for some strains during flowering? My medium is Sh. peat 75%-- 25% mixed soil. First time using this type of medium. total ph for that mix is around 5.0 I believe I feed one with BC Rating: 5