SECRET Fertilizer :) 'fertilizing cocktail' consists of mixing bottle of cheap beer, 1 tablespoon of Epson salts, and 2 tablespoons of fish emulsion in a watering can gallons). Do this to ALL vegetable, flowers, and indoor plants.
Got Blackspot? Get Milk.This really works.A spray composed of one part milk and two parts water is the best answer to the disease. This simple solution, if applied weekly, controls blackspot as well as any synthetic fungicide, including Chlorotalonil.