Things You'll Need
Loppers or pruning shears
Herbicide with glyphosate
Plumbago is a shrub that grows to be approximately 9 feet wide and 9 feet tall. The leaves are small and have a light green and gray coloring. The tips of each vertical growing branch have clusters of light blue, dark blue or white flower blossoms that appear in the summer and last until the fall. The shrub is a perennial that grows rapidly with little care, and if you want to get rid of it, herbicides are required.
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Put on garden gloves and cut back the stems of the plumbago to a height of no lower than 12 inches using loppers or pruning shears.
Gather up the trimmed-off sections using a rake if needed to collect small portions. Place all of the trimmed portions into the trash or place them in a compost pile to decompose.
Unscrew the top from a garden herbicide sprayer and fill it with an herbicide containing the ingredient glyphosate. Use the amount of glyphosate indicated on the bottle for the number of plumbago plants you are treating. Read the label carefully and dilute the mixture with water if the label says to.
Open an oil-based surfactant and pour the amount indicated on the bottle into the garden sprayer. Surfactants are designed to mix with the herbicide and stick to the bark of the shrub better.
Close the sprayer up and shake it well to combine all of the ingredients.
Put on safety glasses and spray all of the remaining plumbago stumps with the herbicide mixture until the bark is saturated.