Everyone knows I work at a landscaping company, so every
October I get the question… “What’s the best way to overseed my lawn”?
At ProQual Landscaping, we manage over 500 acres of common
area landscaping, at 105 Homeowner Associations and Commercial properties throughout
the Phoenix Valley. Commercially overseeding 200 acres of grass is much
different than overseeding a residential yard, so I thought I’d blog about the
process I use to overseed the 1,000 square feet of grass in my backyard.
What is
overseeding, and why?
There are several regions throughout the United States
that experience an extreme difference in temperatures, where the same type of
grass doesn’t survive year-round. With extreme highs of 110+ in the summer, and
lows below freezing in the winter, Phoenix is located in one of those regions.
Parks and lawns in Phoenix are planted with a very durable/heat tolerant Bermuda
grass base. This type of grass survives our hot Arizona summer months, but once
the nighttime temperatures get into the low 70’s, Bermuda grass begins to go dormant.
With that being the case… we must “overseed” this Bermuda grass base with a
grass seed that will thrive during our cooler winter months. We do this with a Perennial
rye seed. See the “How To” below to learn more about this process.
How To Overseed my backyard Bermuda lawn with
rye seed
In a commercial environment we use large tractor riding
style lawn mowers that can mow 7 acres per hour, large spreaders that can
handle 100+lbs of seed at one time and commercial grade irrigation systems that
have capabilities far more than any residential system. For my backyard
project, I will be using a standard gas powered push mower, a line trimmer and
a handheld spreader.
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| My visit to Home Depot |
When to Overseed
Just when your Bermuda grass is looking its best… it’s
time to start the overseeding process! Yes, it is difficult to say goodbye to
your summer grass, but if you don’t say goodbye to it, it will eventually say
goodbye to you.
Typically the best time to do this is during the month of
October, or when the nighttime temperatures drop into the low 70’s.
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| Bermuda lawn before overseeding process |
Preparing to
Overseed
Preparation is the key to success. During this step you will
prepare the area to be seeded, using a multi step process.
1.
2-3 weeks prior to overseeding. Turn your
irrigation down to once a week and start to lower the mow height of your Bermuda
grass.
2.
The week before overseeding. Turn your water completely
off.
3.
The week of overseeding. Final mow and “scalp”. During
this process, you want to lower your lawnmower height, taking the Bermuda grass
down as low as possible. Remove as much of the debris and grass clippings as
you can.
Apply seed
Now that you have a nice prepared surface to work with,
it is time to apply a perennial rye seed. This can be found in bags at your
local Home Depot, Lowes or Ace and should be applied 10-15 lbs per 1,000 square
feet. My yard is right about 1,000 square feet, so I will be applying 15lbs
with a handheld spreader.
Note: if you have any corners or hard to reach places,
hand application might be the best for these areas.
Fertilizer and Top
Dressing
Applying a starter fertilizer and top dressing to your
seed is not necessary, but I consider it to be my “safety blanket”. I am used
to having Account Managers, Foreman, Landscape Crews and Irrigation Technicians
looking over our customers 24/7 to ensure the best possible results. Unfortunately
I don’t have that same luxury in my backyard, so I use a starter fertilizer and
top dressing. The top dressing really helps to provide the best growing
environment, in case my scalp wasn’t perfect, and helps my newly planted seed
retain the moisture it needs to germinate.
For my 1,000 square foot area, I used 4 bags of Top
Dressing and 5lbs of Starter Fertilizer. I applied this with a wheel barrow, shovel
and handheld spreader. I then raked it out nice and even.
Adjusting
Irrigation Controllers
During the seed germination process, it is imperative that
the seed stays moist. This requires you to program your irrigation controller
differently than you would normally, with 4-6 start times, and shorter run
times. For instance, I set my timer to run 6 times each day, starting at 8am and
ending at 6pm. Note: Some residential controllers don’t allow you to set 6
start times on the same program. Get creative and set up 2 programs, with 3 start
times each.
Here is a good programming guide:
Start times: 6
Spray heads: 3-5 minutes per
cycle
Rotor heads: 10-12 minutes per
cycle
Now what?
Now it is time to sit back and watch the grass grow…
literally. For the next 2-4 weeks, your grass will be germinating, to create a
beautiful overseeded winter lawn.
Tips
- Keep an eye on your moisture control. If your
ground appears too dry, turn the water up a few minutes. If your ground appears
too wet, turn the water down a few minutes.
- If you see a spot where seed doesn’t appear to
be coming in, spot seed that area. You can do this by hand applying some seed,
and covering it with a light amount of top dressing.
**10/10/2012 - Update**
So now after 10 days, my rye seed has germinated and is now ready to be mowed. I will be turning back the watering slightly, by removing a few start times, and having the water completely off on my mowing day.
Stay tuned for
updates on the progress of my seeding, along with watering and fertilization tips
for maintaining your winter lawn.
