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| Why not use 1 type of grass seed |
Georgia Turf Magazine........ Lots of customers make this mistake all the time not having the knowledge about selecting good grass seed and how to avoid attack from insects, diseases.
Calling and getting professional advice from a Landscape Company could cause you lots of money out the pocket instead of doing your-self a dis-service and building a problem across your whole lawn.

There are several reasons for using a blend of grass seeds in your
lawn. Like all living things grass seeds can be attacked by different
pests or conditions and if you have only one kind of grass seed in your
lawn you could lose your entire lawn to an attack from insect, disease
or other pest.
For instance, perennial rye grasses can be killed by pythium blight
which is a disease that is triggered by really humid conditions. This
isn’t something to be overly concerned about if you have a blend of
grasses in your lawn because the Kentucky blue grasses and the fescue
grasses won’t be affected by the blight.
But you want perennial rye grasses in your lawn because they are
quick germinating, they have a nice green color and most of the
varieties used today have a fine texture, almost as fine as Kentucky
blue grass.
Secondly, it takes Kentucky blue grass a long time to germinate, up
to 28 days, whereas perennial rye grasses can germinate in as few as 5
or 6 days. Quick germination is important because if you planted a lawn
of 100% Kentucky blue grass chances are the lawn will be full of quick
germinating weeds before the Kentucky blue has a chance to even come
up.
So when you use a blend of grass seed, the fast germinating
perennial rye grasses act as a nurse crop protecting the Kentucky blue
grass seeds while they go through their long germination period.
WHY THE PRICE OF GRASS SEED MATTERS WHEN LOOKING FOR THE RIGHT SEED FOR YOUR LAWN
Like everything else, with grass seed you get what you pay for. My
suggestion is to go to a place that sells bulk grass seed, maybe a full
service garden center or farm supply store and shop price.
Find a good
middle of the road blend of grass seed. Don’t buy the lowest price and
don’t buy the highest priced seed. If you buy really cheap grass seed
it’s likely to have a lot of annual rye grass and other not so desirable grasses.
You’ll end up with a lawn with a lot of thick
bladed grasses that would be more suitable for a pasture.