Expert Advice

Annual Bluegrass

Problem

Annual bluegrass often thrives in moist, rich or compacted soil. Mid to late spring white seed heads are formed on the plants, these seeds then fall to the soil and germinate in cooler weather of late summer to midfall. Annual bluegrass does not tolerate drought stress and dies in the summer.

Life Cycle

Annual bluegrass reproduces by seeds and lives for a year, but grows rapidly in cool spring weather.

Solution

The best defence against annual bluegrass is a healthy lawn. If your lawn is fertilized regularly, mowed accurately and irrigated properly it will be able to withstand and choke out a weed invasion. First and foremost, watering deep but less frequent will allow the roots of your grass to deepen and in turn prevent the growth of all kinds of weeds. If we think about how seeds germinate like a newly planted lawn, the more often we water the more likely new grass seeds would germinate. So, anything we can do to avoid providing constant moisture to a weed seed bed by watering deeply enough that the existing plants have water in their root zone and even if a new weed germinated, it wouldn’t be able to source enough water long enough to survive.

Always keep your lawn around 3” long, this will give your soil some shade and will prevent any weeds from germinating, especially along the edges. All seeds regardless of type need sunlight at the soil where the seed is present to germinate, so remembering that like mulch in your gardens, if we can prevent the sunlight from reaching the seed when the conditions are favorable for germination, the seed won’t germinate.

An annual aeration is also recommended to loosen compacted soil, this gives your lawn a great advantage by opening the root system, allowing for air, nutrients and moisture to flow optimally, minimizing annual bluegrass germination.

If you do get the occasional weed on your lawn, the best solution would be pulling out the weed with its roots or by applying a selective weed control product that is available at your local retail outlet. If you feel like you’ve tried everything and need professional help, we offer a 6 visit program with weed control to help your lawn withstand weed invasion. If you have any questions about weeds on your lawn, don’t hesitate to give us a call and a lawn care specialist will be happy help.