What Will Kill Rhododendron

Prepare 1/2 gallon of an 18- to 21-percent solution of glyphosate or triclopyr herbicide in a plastic jug. Glyphosate and triclopyr are the two herbicides approved for home use and available at any garden store.

Will vinegar kill rhododendron?

You can definitely use vinegar in the garden on certain plants like rhododendrons and gardenias. Easy to grow flowers like hydrangeas and azaleas also thrive in soil with a low pH so vinegar works well for them, too. … Killing a tree with vinegar is also possible, whether you do it accidentally or on purpose.

How do you kill rhododendron roots?

Brush a nonselective herbicide such as glyphosate, triclopyr or imazapyr, diluted according to manufacturer directions for cut stump applications, onto the freshly cut stump surface.