Inspect a bit. Powdery Mildew shows as droplet sized patch or patches on the leaves that look like tiny bits of cotton. Residue from water splash is more like a dried mineral deposit. Also bits of perlite or rock dust can get stuck on lower leaves that are close to the ground depending on what's in your soil.
Soil fungus is normal in organic mixes. Also could be some symbiotic connection between the GG plant and its volunteer neighbor. Something digesting the molasses probably.
Soil fungus is normal in organic mixes. Also could be some symbiotic connection between the GG plant and its volunteer neighbor. Something digesting the molasses probably.