How are you testing the runoff ph, and exaculy what brand and type of soil are you using? Outdoor composts tend to be buffered to a lower ph than potting soil.

I've got a couple of non-purple (that I know of) strains that exhibit 'purpling' throughout growth cycle, and are fine otherwise. Some used to tell me it's from a phosphorous deficiency, but I use Phosphoric acid, so 'they' were wrong, lol. :jointsmile:

Any other symptoms?