Most seed mixes will have a nurse grass, meant to germinate quickly to hold
everything else in place. The nurse grass will then die off and be replaced
by the other cultivars.

The poster below has made some very good comments as well.

One other consideration would be to check for insect damage if your brown
spots have not yet recovered.

Peter H


"Midwest Div" wrote in message
news:tic0f.15$wR4.7@trnddc03...
Certainly it's possible, but not desirable. The advantage with a blend is
that certain grasses do well in sun, some in shade, some weather better in
drought, while others do better when cool and wet. A single grass may
completely die off by disease where with a blend some will die and be
replaced by others.

BTW, I would pass on any seed that has a lot of tall fescue; it's rank.
Talk
with you local county agriculture agent as to what he would recommend for
your area (soil type and weather conditions).

"John" wrote in message
...
Is it possible or even desirable to buy one breed of grass ? I was
thinking about putting in Thermal Blue after this summers brown-out of
my lawn but I read the package contents for Scotts Pure Premium
Heat-Tolerant Blue Grass Seed and noted that it's in fact only 10%
Thermal Blue and the rest is Tall Fescue.

JD