Is this mold or mineral deposits on my plants soil? I had a problem with what I thought was mold for these Chinese evergreens 2 weeks prior, so I changed out the soil and added some materials to help with drainage. I then watered them and 5 days later I saw what I thought was mold developing so I watered them with a hydrogen peroxide mix and added cinnamon to remove and prevent mold growth. I have also been putting them in a sunnier spot to prevent mold. I now see that this white substance continues to appear on the soil so I was wondering if it was mold or mineral deposits from watering. If it is mold what other solutions are there to prevent further growth?