Japanese Knotweed Stem Injection

The Challenge of Japanese Knotweed

Japanese Knotweed is a notoriously invasive plant species capable of causing extensive damage to structures and natural ecosystems. Various methods exist for its control, but one that stands out for its effectiveness and environmental sensitivity is Japanese knotweed stem injection.

Why Opt for Stem Injection Over Herbicide Spraying?

Unlike traditional herbicide spraying, stem injection specifically targets Japanese Knotweed without affecting surrounding flora. This makes it a preferred method in gardens, lawns, public spaces, and ecologically sensitive areas where the wellbeing of other plants is a concern.

How Does Japanese Knotweed Stem Injection Work?

The stem injection method involves using specialized equipment to inject a concentrated dose of glyphosate herbicide directly into each cane of the Japanese Knotweed plant. This localized application ensures that the herbicide is absorbed through the rhizome and deep into the root system, offering an effective way to control the invasive species completely.

Ideal Scenarios for Stem Injection

Stem injection is especially useful in environmentally sensitive locations, such as areas close to water bodies. The method minimizes the risk of water contamination and is less harmful to the surrounding environment compared to other methods.

Our Japanese Knotweed Stem Injection Program

Much like our herbicide spray treatments, our Japanese knotweed stem injection program typically involves multiple applications over several years. The number may vary based on how well the plant absorbs the herbicide. All herbicides used are DEFRA approved and are applied during the knotweed’s growing season, from May to November.

Preparing for Stem Injection: Winter Maintenance

To maximize the effectiveness of stem injection, it’s crucial to prepare the site during winter. This includes cutting, mulching, and removing dead canes along with any obstacles that may hinder new shoots in the spring.

Advantages and Disadvantages 

Advantages

• Targeted application prevents harm to other plants
• Ideal for use near water bodies
• Approved by environmental agencies

Disadvantages

• May require multiple applications for several years
• Specialized equipment needed

Frequently Asked Questions about Japanese Knotweed Stem Injection

When should stem injection for Japanese Knotweed be done?

Stem injection is most effective during the active growing season, typically from May to November.

How does stem injection compare to herbicide spraying?

Stem injection is more targeted, reducing the risk to surrounding plants and environments, but may require specialized equipment.

Contact Us for Tailored Stem Injection Solutions

Interested in a customised Japanese knotweed stem injection treatment plan? Contact us to schedule a consultation and explore the most suitable options for your situation.