This year I have harvested more seeds than I will use next spring. I plan to vacuum-seal them and I want to know if, except for drying them really well, I should consider anything in particular.

These seeds were harvested from plants that belong to the following genera: Calendula, Celosia, Centaurea, Cosmos, Dianthus, Echinacea, Helianthus, Lavatera, Matricaria, Tropaeolum and Zinnia.

  • 2
    Can't speak for all of them, but Calendula and Nasturtium seeds I've just popped in an ordinary, sealed letter envelope (once they were air dried), folded up and put inside a tin, and they still grew five years later
    – Bamboo
    Dec 16, 2017 at 19:33
  • 2
    At first I thought that you collect seeds with a vacuum cleaner.
    – VividD
    Dec 16, 2017 at 20:10
  • I would just put them in the plastic and vacuum seal away. As long as they are dry they would be best preserved in a vacuum sealed bag in the freezer. I am still on the fence about freezing or just cool, dark, stable temperatures. Mine are all vacuum sealed..
    – stormy
    Dec 17, 2017 at 4:39

1 Answer 1


The enemies of seeds are: heat, light and humidity, by controlling these you can store some seeds for many years.
Keep seeds at a cool to cold temperature of 40 degrees or less. Avoid fluctuations in temperature such as a garage or storeroom that is cold in winter but blazing hot in summer. Avoid light and never store seeds in direct sunlight or a well lit room.

  • are you sure about the light without heat? Dec 19, 2017 at 22:21
  • I'm not sure what you mean, could you elaborate Dec 19, 2017 at 22:24
  • Some seeds are inhibited by light. Dec 19, 2017 at 22:26
  • Ok but I'm still not getting your point, you said are you sure the light without heat explain this comment from the context of my answer Dec 19, 2017 at 22:30
  • Does light without any accompanying heat cause seeds to germinate? Dec 19, 2017 at 23:54

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