I had one batch of seeds a couple of years ago of Sophies Choice that was terrible. Have no idea why and every other variety did well that year. This year I may be seeing my first evidence of lower germination rates due to aging seeds. I have some sown a week ago today that I am still waiting for. I noticed that some of the seeds are now 5 years old. 7 days is kind of long for tomatoes on a heat mat in my experience. In the past I have gotten about 90% germination. It will be interesting to see if the overall germination decreases or just slows down.
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