Create a non-toxic treatment for black spots on roses. Combine one tablespoon of baking soda, one tablespoon of vegetable oil and one drop of liquid detergent in one gallon of water and shake. Fill a spray bottle with this mixture and when the humidity rises, spray your roses down - making sure to get both sides of the leaves.

Apply baking soda and water to your plants regularly. Just mix the two ingredients in a spray bottle and mist the leaves of your plants. This mixture acts as a natural anti-fungal treatment. Harmful pesticides can be avoided if you use a baking soda mixture at least twice a week.