Bermuda grass is known for its aggressive growth and ability to choke out other grass varieties, including St Augustine grass. This is because Bermuda grass has a dense and spreading growth habit, allowing it to outcompete other grasses for sunlight, nutrients, and water.
To effectively choke out St Augustine grass with Bermuda grass, it is important to follow a few key steps:
1. Mow low and mow often: Bermuda grass thrives when it is cut short, so regularly mowing your lawn at a low height will encourage its growth and limit the growth of St Augustine grass. Aim to mow your lawn to a height of around 1-1.5 inches for Bermuda grass.
2. Regularly dethatch your lawn: Thatch refers to the layer of dead plant material that accumulates between the grass blades and the soil surface. Excessive thatch can create a barrier that prevents water, air, and nutrients from reaching the roots of your grass. Using a thatch rake or dethatcher to remove this layer can help promote Bermuda grass growth and suppress St Augustine grass.
3. Apply herbicides selectively: If St Augustine grass persists despite mowing and dethatching efforts, you may consider using herbicides to target and suppress its growth. However, it is important to carefully select herbicides that are safe for Bermuda grass and follow the instructions provided by the manufacturer. Spot-treating affected areas can help prevent damage to the Bermuda grass while effectively controlling the St Augustine grass.
4. Provide optimal growing conditions for Bermuda grass: Bermuda grass thrives in full sun and well-draining soil. Ensuring that your lawn receives adequate sunlight, proper irrigation, and appropriate fertilization can help promote Bermuda grass growth and discourage the growth of St Augustine grass.
In my personal experience, I have successfully used these methods to transition my lawn from a mix of St Augustine and Bermuda grass to predominantly Bermuda grass. Regular mowing at a low height, dethatching, selective herbicide application, and providing optimal growing conditions for Bermuda grass have all played a crucial role in choking out the St Augustine grass and allowing the Bermuda grass to take over.
It is important to note that completely eradicating St Augustine grass from a Bermuda grass lawn may require ongoing maintenance and vigilance, as St Augustine grass can be resilient and may continue to appear in patches. However, by following these steps consistently and regularly, you can effectively suppress the growth of St Augustine grass and promote a healthy and lush Bermuda grass lawn.
