Even with guano, you'll want to back off the feeding regimen during the last two weeks and just use water, maybe some molasses. All fertilizers, chemical and organic, need to be flushed from the soil prior to harvesting. They all leave a sharp aftertaste that's undesirable. The yellowing is normal, and you don't want to reintroduce too much extra Nitrogen that could promote foliage and rob you of any last-ditch bud mass.

Have fun with them... they look tasty! :jointsmile: