Herbs That Take Over: A Comprehensive Guide

In the realm of gardening, the phrase "which herbs take over" often sparks curiosity and concern. While many herbs are beloved for their culinary and medicinal properties, some can become invasive, outcompeting other plants for resources and space. Understanding which herbs are likely to take over can help gardeners make informed decisions about what to plant and how to manage their gardens.

Herbs can be categorized into two groups based on their growth habits and potential to take over: aggressive spreaders and prolific self-seeders. Aggressive spreaders are plants that spread rapidly through runners, rhizomes, or suckers, while prolific self-seeders produce a large number of seeds that can germinate and establish new plants in the garden.

Aggressive Spreaders

Aggressive spreaders are herbs that can quickly colonize an area, often forming dense mats that can be difficult to control. While their invasive nature can be a concern, many aggressive spreaders are also highly valued for their hardiness, productivity, and ability to thrive in challenging conditions.

One of the most notorious aggressive spreaders is mint (Mentha spp.). Mint is a vigorous grower that spreads through runners, forming extensive colonies that can take over a garden if left unchecked. Other aggressive spreaders include comfrey (Symphytum officinale), which spreads through rhizomes, and horseradish (Armoracia rusticana), which spreads through both rhizomes and root fragments.

Mint (Mentha spp.)

Mint is a popular herb known for its refreshing flavor and numerous culinary and medicinal uses. However, its aggressive growth habit can make it a challenge to control. To manage mint, it's best to grow it in a contained area, such as a pot or a bed surrounded by a barrier that prevents its runners from escaping. Alternatively, you can grow mint in a dedicated area where its invasive nature is less of a concern.

Mint is not the only aggressive spreader that can be managed with careful planning. Comfrey and horseradish can also be contained using similar methods. By understanding the growth habits of these herbs and providing them with the space they need, gardeners can enjoy their benefits without allowing them to take over the garden.

Comfrey (Symphytum officinale) and Horseradish (Armoracia rusticana)

Comfrey and horseradish are both valuable herbs with deep root systems that can mine nutrients from the soil and improve its structure. However, their aggressive growth habits can make them difficult to control. Like mint, these herbs can be managed by growing them in contained areas or providing them with ample space to spread.

Another approach is to plant these herbs in areas where their invasive nature is less of a concern, such as along the edge of a property or in a dedicated composting area. By strategically placing aggressive spreaders, gardeners can harness their benefits while minimizing their potential to take over the garden.

Prolific Self-Seeders

Prolific self-seeders are herbs that produce a large number of seeds, which can germinate and establish new plants in the garden. While self-seeding can be a convenient way to propagate herbs, it can also lead to unwanted plants popping up in unexpected places. Understanding which herbs are prolific self-seeders can help gardeners manage their gardens more effectively.

Some of the most prolific self-seeders include parsley (Petroselinum crispum), cilantro (Coriandrum sativum), and dill (Anethum graveolens). These herbs are all members of the carrot family (Apiaceae) and produce copious amounts of small, flat seeds that can be easily dispersed by wind or animals. Other prolific self-seeders include borage (Borago officinalis), which produces vibrant blue flowers that attract pollinators, and lemon balm (Melissa officinalis), which has a pleasant lemony flavor and is known for its calming properties.

Parsley (Petroselinum crispum), Cilantro (Coriandrum sativum), and Dill (Anethum graveolens)

Parsley, cilantro, and dill are all popular culinary herbs that can be easily grown from seed. However, their prolific self-seeding habits can lead to unwanted plants appearing in the garden. To manage these herbs, it's best to grow them in dedicated areas where their self-seeding is less of a concern. Alternatively, you can remove flower heads before they set seed to prevent self-seeding.

Another approach is to allow these herbs to self-seed in areas where their presence is desired, such as in a dedicated herb garden or as a living mulch in the vegetable garden. By strategically managing prolific self-seeders, gardeners can enjoy their benefits while minimizing their potential to take over the garden.

Borage (Borago officinalis) and Lemon Balm (Melissa officinalis)

Borage and lemon balm are both valuable herbs that can be managed using similar techniques as parsley, cilantro, and dill. By growing these herbs in dedicated areas or removing flower heads before they set seed, gardeners can prevent unwanted self-seeding and maintain control over their gardens.

Additionally, both borage and lemon balm can be harvested and dried for later use, which can help to reduce the number of seeds produced and prevent excessive self-seeding.

In the world of herbs, understanding which plants are likely to take over is essential for creating a balanced and manageable garden. By categorizing herbs into aggressive spreaders and prolific self-seeders, gardeners can make informed decisions about what to plant and how to manage their gardens. With careful planning and strategic placement, gardeners can enjoy the benefits of even the most invasive herbs without allowing them to take over the garden. So go ahead, experiment with different herbs, and embrace the challenge of creating a thriving, diverse garden that is both beautiful and functional.