My goodness you make me hungry for sweet potatoes. I'll be right over. Here's a link that looks like it will be of use to you. http://www.aces.edu/pubs/docs/A/ANR-0917/

I wish I knew how rhizo,...I am so so dumb even with the instructions!!!I need to elarn though...Do you how? do you know what is the easiest instructions to do so. I mean easy. I read the post on this site, and I couldn't get it :-(

I do see color developing in the grout, but it is orange in color and I assumed it was iron in the water - which we see in this area (not specific to the house we currently live in). Can copper staining also create an orange color, I wonder?

I thought that was fert. burn, or water burn, like cold water misted on the flowers/plants... then put under growlights and it burns the bloom. IF it is under growlights. I do assume the white stripes is the variety....right? You are talking about the tiny lighter spots on the blooms? Frankly to me, if it is a virus, it is making the bloom look better. But if it screws up the plants, then it is a problem. But I have seen this on Brand NEW violets FROM Optimara, at Lowes, and they water from above.