If moisture built up in the bag, some of the seed could have rotted or
prematurely sprouted. Look on the bag itself, it should have an expiration
date on it. After the expiration date, the germination rate of the seeds
declines, but have them already, might as well use them up.
Seeds tend to deteriorate (go bad) over time, but not completely.
Depends on how it was stored (heat, moisture, etc.)
Depending on the amount, I would just look for some bare spot,
then sprinkle it on, and not worry. I certainly wouldn't send it
out with the regular rubbish, to a landfill.
It depends on how it was stored, because it sort of has a half life.
The germination rate decreases with time. In cool locations the
germination rate is better. In hot locations it degrades faster. If
stored in a sealed plastic bag, in a cool place, it will last the
longest. If stored in the open in a hot humid environment, it won't
last very long. However, unless it molds or rots, probably some grains
will still germinate.
What I am saying, it it is best to dispose of it on places on your lawn
that need reseeding. It certainly can't hurt and may be viable. Seed
companies test lawn seed to see if it is still viable. For them,
something like a 90% germination rate is acceptable.
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Cheers, Steve Henning in Reading, PA USA
Exactly. If you don't see enough sprouts in a week, go and get some fresh
seed if you want. It's not like the non-viable seed will be fighting any
fresh seed for food.
What else would you do with the seed, even if it wasn't viable? Throw it in
the garbage so it can go to a landfill? Put it in your compost pile, and
risk that there are just enough viable seeds left to cause problems? Flush
it down the toilet?
There no harm in putting non-viable grass seed on the lawn (assuming it's
the seed for grasses that you want on your lawn). The worst that will happen
is you'll put off buying fresh seed for a week. The best that can happen is
it'll turn-out to be viable seed. Just don't judge the brand of seed based
on what will probably lower than normal germination rates.
wet a paper towel, place 20-30 grass seeds in a row. roll towel, put in plastic
and stick on top of frig. or other warm place. come back in a few days open
how many sprouted. germination tests are generally done to see if seeds are
otherwise isnt worth it to try to use it to seed.
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