Not Basil: The Fragrant Herb That Deters Carrot Plant Pests & Keeps Them Healthy

Carrots are overall considered an easy vegetable to grow; as a result, they're often a top plant for beginner gardeners looking to test their green thumb for the first time. However, carrots are susceptible to a variety of different common garden pests, including caterpillars, leafhoppers, and the notorious carrot rust fly. Because of this, many carrot enthusiasts may choose to take to plants like basil (Ocium basilicum) to help keep pests at bay. However, basil isn't your only option. You can also incorporate this fragrant herb as another layer of defense in your garden's pest management plan.

Rosemary (Salvia rosmarinus, previously known as Rosmarinus officinalis) is a fragrant bush that's as eye-catching in the garden as it is useful. For some people, growing rosemary may not go beyond its use as a culinary ingredient or as an herb that can be readily rendered into potpourri for added fragrance (perfect for crafting an inviting scent in your entryway or other small spaces).However, rosemary is also commonly grown as a companion plant that may help discourage pests, including carrot rust flies.

One study found in the National Library of Medicine tested rosemary essential oil's repellent effects for a specific beetle species (Callosobruchus maculatus) and found that it repelled approximately half of the insects in the study, suggesting rosemary contains compounds with insect-repelling properties While plants alone may not be enough to deter carrot plant pests entirely, adding rosemary to your garden can be a good way to extend prevention coverage while also providing you with a fragrant herb that pollinators also adore.

In order to successfully grow rosemary as a carrot companion plant, you'll need to learn how to care for this plant. After all, rosemary can only serve as an effective companion plant if it's healthy and thriving. Fortunately, this plant is easy to grow, which means it won't be too difficult to cultivate alongside your carrots.

The first thing to learn about rosemary is its USDA growing zones. These are the places where this herb is winter hardy and thus can survive the average colder climate, ensuring that it can come back year after year in your garden. Rosemary is hardy in zones 8 through 10.

As for its other care requirements, rosemary does require full sun. This allows them to pair readily with carrots, which also need ample sunlight to produce those vibrant, nutrient-dense vegetables. Overall, rosemary is an incredibly hardy herb. It holds up well to dry, poor soil, drought, humidity, and heat, all while remaining resistant to those common garden pests like deer and slugs as well. Just keep in mind that rosemary may require occasional pruning, especially after flowering. On the bright side, it does tolerate heavy pruning.