Oscar's Horsetail Tea to treat Powdery Mildew Prevents, cures and gives immunity to Powdery Mildew and Botrytis For use on medicinal herbs, food crops, roses, and any plant with Powdery Mildew or Botrytis. Easy to use. Just make tea, dilute and spray on plants. Safe for human consumption (and healthy!). Makes 6 gallons of spray. Treated plants will test free of mold, spores, mildew, etc. Every order shipped via Priority Mail on same or next business day. Shipped in plain box with discreet label.