In a large skillet over medium heat, heat oil. Add onion and cook, stirring occasionally, until softened, about 7 minutes. Add garlic and cook, stirring, until fragrant, about 1 minute more.

Roses are still growing flowers in autumn, and can be easily damaged or not grow properly if you do not deal with slugs eating them. Luckily, there is a simple way to keep slugs away from roses.