Killen Grass, also known as Johnsongrass, is a perennial grass that is native to the Mediterranean region. It is a highly invasive weed that can quickly take over lawns, gardens, and agricultural fields. Killen Grass treatment is essential to prevent its spread and protect the health and aesthetics of your landscape. In this glossary, we will explore what Killen Grass is, its characteristics, the problems it can cause, and the various treatment options available.

What is Killen Grass?

Killen Grass, scientifically known as Sorghum halepense, is a tall, coarse grass that can grow up to 6 feet in height. It has broad leaves and produces large, feathery seed heads. The grass spreads through underground rhizomes, which allow it to quickly colonize an area. Killen Grass is adaptable to a wide range of soil types and environmental conditions, making it a formidable weed.

Characteristics of Killen Grass

Killen Grass has several distinguishing characteristics that make it easy to identify. Its leaves are long and narrow, with a prominent midrib. The leaf blades are rough to the touch and have a distinct blue-green color. The grass produces dense seed heads that are purplish or reddish in color. The rhizomes of Killen Grass are thick and fleshy, allowing the plant to store energy and survive adverse conditions.

Problems Caused by Killen Grass

Killen Grass is considered a noxious weed due to its aggressive growth and ability to outcompete desirable plants. It can quickly invade lawns, gardens, and agricultural fields, reducing the productivity and aesthetic value of the area. The grass competes for nutrients, water, and sunlight, depriving other plants of essential resources. Additionally, Killen Grass can release allelopathic chemicals that inhibit the growth of nearby plants.

Identification of Killen Grass

Proper identification of Killen Grass is crucial for effective treatment. The grass can be distinguished from other similar-looking species by its characteristic seed heads and rhizomes. The leaves and stems of Killen Grass are also distinctive, with a rough texture and blue-green color. If you suspect the presence of Killen Grass in your landscape, it is recommended to consult a professional for accurate identification.

Killen Grass Treatment Options

There are several treatment options available for controlling Killen Grass. The choice of treatment depends on the severity of the infestation and the desired outcome. Some common treatment methods include:

1. Herbicides

Herbicides are the most effective way to control Killen Grass. Selective herbicides can be used to target the grass while leaving desirable plants unharmed. Non-selective herbicides, on the other hand, can be used to kill all vegetation in the affected area. It is important to follow the instructions provided by the manufacturer and use herbicides responsibly to minimize environmental impact.

2. Manual Removal

In small infestations, manual removal of Killen Grass can be effective. This involves digging up the rhizomes and removing the entire plant from the ground. It is important to ensure that all rhizomes are removed to prevent regrowth. However, manual removal may not be practical for large infestations or areas with difficult access.

3. Cultural Practices

Implementing cultural practices can help prevent the spread of Killen Grass and promote the growth of desirable plants. Regular mowing can prevent the grass from producing seed heads and spreading further. Maintaining a healthy lawn or garden through proper watering, fertilization, and aeration can also make it more resistant to Killen Grass infestations.

4. Integrated Pest Management

Integrated Pest Management (IPM) is a holistic approach to pest control that combines multiple treatment methods. IPM strategies for Killen Grass may include a combination of herbicide application, manual removal, and cultural practices. This approach aims to minimize the use of chemicals while effectively managing the weed problem.


In conclusion, Killen Grass is a highly invasive weed that can cause significant problems in lawns, gardens, and agricultural fields. Effective treatment options include the use of herbicides, manual removal, cultural practices, and integrated pest management. Proper identification of Killen Grass is essential for successful treatment. If you are facing a Killen Grass infestation, it is recommended to consult a professional for guidance and assistance.