Answer: Grass seeds loses viability as it ages, especially if it has been exposed to heat or moisture. The best thing to do is to try germinating a handfull of grass seed in a container filled with potting soil. Scatter the seeds on the soil, water them well and keep them moist for 7-10 days. You'll be able to tell whether all, half or some of the seeds are viable. With this information you'll know whether to broadcast the seeds at a normal rate, double rate or triple rate when reseeding your lawn.
Best wishes with your lawn!
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