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This is the best way to protect roses from Black Spot. …
This is the best way to protect roses from Black Spot.
- Mix one tablespoon of the salts with 4L water, and water around the base of your roses.
- This solution is enough to treat 4 plants. Alternatively you can sprinkle 1 teaspoon of salts around the base of each rose and water in well.
- Apply once a month from April to June.