31,800 years or so ago, busy arctic squirrels of northeastern Siberia stored more campion seed than they could consume. Of a store of more than 600,000 such seed, which were found deep below permafrost, three immature seed contained viable embryos. These three embryos were extracted and grown into plants that bloomed and produced new seed as they would have 31,800 years ago.
A 2,000 year old date palm seed, which was found in the palace of Herod the Great on Masada in Israel, is the oldest known intact and mature seed to germinate. It was approximately 29,800 years younger than the miraculously viable embryos of the Siberian squirrel stashed campion seed, but is ridiculously older than the oldest of the old seed in my partly neglected collection. There is hope.
Some of the seed that I saved is not dated because, at the time, I figured that they would be sown during the following season. A few of those that are dated are embarrassingly from five years ago. I know that canna seed lasts much longer than that. So do seed of some of the most aggressively invasive exotic species, such as broom and Acacia dealbata. Vegetable seed are not so fortunate.
However, I cannot discard them without giving them a chance. If they do not germinate on schedule, replacements will be sown immediately.
The two cans of seed to the left in the picture above are for two unknown varieties of pumpkin, and might have been three years old last autumn. Butternut squash seed to the upper middle is about the same age. Hyacinth bean seed to the lower middle is perhaps a year older. Blue dawn flower seed to the upper right is at least five year old. Parsley seed to the lower right was packed for 2015.