When Does Annual Ryegrass Die? When to Plant It

Annual ryegrass is ideal for areas that experience cool climate conditions like the northers areas of the United States and in transition zone. However, this type of grass has a short lifespan that last for a single growing season. So, when does annual ryegrass die?

Annual ryegrass will die naturally in late spring or early fall at the end of growing season. Prolonged harsh weather conditions like extreme daytime temperatures (below 50 degrees Fahrenheit or above 90 degrees Fahrenheit) can also cause it to die.

When Does Annual Ryegrass Die?

Annual ryegrass only last for one season and will die on a quite regular basis. Further, it’s not tolerance to extreme temperatures. It will die when temperatures are too hot or too cold. The timeframe may vary depending on your location and when you planted the grass.

Here is typically when annual ryegrass will die:

1. Dies off naturally in late spring or early fall

Annual ryegrass has a relatively short lifespan, it will die off naturally in late spring or early fall. The time of death coincide with the time the grass is planted. If you want a green lawn throughout the year, over-seed a warm-season grass with annual ryegrass in late spring.

In the Southern Atlantic Coast, Texas, Gulf Coast and Midwest of the United States, annual ryegrass is usually as a fodder crop. Over-seeding perennial grass or warm-season grass with annual ryegrass will extend the grazing season into winter.

2. Dies off in hot temperatures above 90 degree Fahrenheit

Annual ryegrass is drought tolerance. However, it cannot withstand temperatures above 90 degree Fahrenheit (32.2 degree Celsius) for a prolonged period of time. Temperatures above 75 degree Fahrenheit (24 degree Celsius) will cause it to enter dormancy.

As the temperature continue to rise, the grass will stop growing. The blades will start to change the color from green to brown. Eventually, the high temperatures will kill the grass completely regardless of daily watering.

3. Dies off in low freezing temperatures

Annual ryegrass is vulnerable to extreme temperatures, it will not thrive in areas that receive temperatures below freezing. High humidity and melting snow creates unwanted moisture that is detrimental to the grass. It can lead to bacterial and fungal infections.

In temperatures below freezing, annual ryegrass will change color from green to brown and die off completely. Annual ryegrass thrives in temperature range of 50 to 65 degree Fahrenheit (10 to 18 degree Celsius). Freezing temperatures will cause the grass to die.

When to Plant Annual Ryegrass

Plant annual ryegrass in fall or spring when temperature range between 50 and 65 degree Fahrenheit (10 to 18 degree Celsius). Planting at this time will ensure fast germination and quick establishment of the grass. Early establishment in the northern parts of US enhances resilience against drought.

Annual ryegrass germinates well in both warm and cool soil. Prepare the soil in advance by tilling to a depth of 6 inches and rake it free of rocks and other debris. Brake the large clots and fill the dips. Be sure the soil is well drained prior to seeding.

Fertilize the soil with fertilizer rich in nitrogen and phosphorus. Nitrogen helps to boost the initial growth while phosphorus promote better root development. Be sure not to under or over fertilize the soil. Generally, it is recommended to apply 1lbs. per 1,000 square feet of lawn.

There are several seeding methods you can use to plant your grass. They include drill, broadcasting, aerial and dormant seeding.

Annual ryegrass is usually seeded at a rate of 12 to 15lbs. /ac when using drill method. When using a broadcasting, aerial or dormant method of seeding, it is recommended to increase the ratio to 20 to 25 lbs. /ac.

Supplement rainwater with irrigation to ensure your lawn is getting at least 2 inches of water per week. Water daily until the seeds germinate. As the grass establish, reduce watering gradually to once or twice a week depending on weather conditions.

Once the lawn grass has established mow regularly at the recommended height. Generally, it is ideal to mow annual ryegrass at a height of 1.5 inches. During the time of heat and low rainfall, increase the mowing height to 2.5. Use a mulching blade when mowing to conserve soil moisture content.

If you’re establishing annual ryegrass for pasture, allow it to attain desired height before cutting or feeding it to your animals.

Does Annual Ryegrass Come Back Every Year?

The short answer to this question is no, annual ryegrass does not come back every year. Unlike perennial ryegrass that comes back multiple seasons, annual ryegrass lives only for a single growing season. It is usually planted in spring or fall and will die at the same period the following year.

Although when given proper care and growth conditions, it can reseed itself. Rake to remove debris from the last season, fertilize and water your lawn to give it an opportunity to reseed itself for the next growing season.

However, annual ryegrass will require yearly reseeding even if it reseed itself. Reseeding this type of grass is beneficial to farmers or gardeners who are utilizing it as a cover crop to improve soil fertility or as pasture for grazing.

When planting annual ryegrass for forage, it is ideal to practice crop rotation. Planting the same crop in the same place year in year out will deplete nutrients and lead to build-up of pests and diseases. You can rotate grass with legume plants such as soy beans to replenish the soil with nutrients.

Is Annual Ryegrass Good for Lawns

Annual ryegrass is not best for permanent lawns due to its short lifespan. It’s a single season grass that need to be reseeded after each year. However, it is a temporal cool-season grass that is ideal for over-seeding with warm-season grass such as Bermuda.

It provides a green lawn during winter when the warm-season grass enters into dormancy. Annual ryegrass can also provide temporal solution of controlling soil erosion on a newly constructed lawn. It offers the best covers for bare soil to prevent wind and water runoff erosion.

Annual ryegrass is a versatile crop that is useful for other purposes such as:

Good cover crop

Annual ryegrass has a positive impact to the health of the soil. It is helpful in regaining fertility in the farms where the soil has been depleted off nutrients. It has dense root system that break up into the soil to provide ample aeration.

The roots penetrates deep into the soil to obtain nitrogen and bring it back up on the surface. It help to bring the nutrients within reach of other plants.

Good for forage

Annual ryegrass is not only good for lawns or cover crop, it’s also ideal for forage. It’s rich in proteins, digestible fiber and other nutrients that are essential to livestock. Different livestock such as cattle, sheep and goats all graze on annual ryegrass.

Final Thoughts

Annual ryegrass is a cool-season grass ideal for over-seeding with a warm-season grass like Bermuda to provide a green lawn in winter. It’s also a good fodder crop for livestock as well as an ideal cover crop to control soil erosion. Unfortunately, you have to reseed it yearly at the end of the season when it die.

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