Both are highly dangerous to gardeners and their desirable plants, along with the insect and microbial life of the soil they come in contact with. Bleach, like salt, contains chlorine, which is toxic to plant tissues and can build up in the soil long after your targeted rose is gone.

Will bleach kill roses?

Avoid using household chemicals to kill the rose bush.

Some people will advise you to use household chemicals such as salt, vinegar or bleach to kill roses. However, this is not recommended as these chemicals are likely to contaminate the soil, making it difficult to cultivate the area later.

What is the best way to kill multiflora rose?

The herbicide triclopyr (Pathfinder II) can be applied to multiflora rose stems to kill the top growth, either after cutting, or to intact plants as a basal bark application.