Freeze-Dried Garden Seeds

Freeze-Dried Garden Seeds

Recently, the head engineer at Harvest Right wondered what would happen if he freeze-dried seeds. Would they germinate?

He freeze dried 10 different types of vegetable seeds, started them under grow lights inside his home, then transplanted them in a Garden Right geodesic dome greenhouse. It worked! Every single one of the seeds germinated – but you might be wondering what the practical applications would be. On a micro level, gardeners sometimes struggle to preserve heirloom seeds from one growing season to the next. If you don’t get your seeds absolutely dry or you don’t store them properly, they’ll mold and become unusable. On a macro level, it gets interesting.

There are thousands of seed banks around the world. They’re usually built in cold, remote places – like Svalbard. The problem is many of these cold, remote places are also politically or geologically unstable. Svalbard’s seed bank is a pretty safe bet. Even if the ice caps melt, the bank will be above sea level, there’s little chance of an earthquake, and it’s always frozen. Seeds can remain viable in the Svalbard seed bank for hundreds or thousands of years. So, in case there’s a major event and you need to grow some food from scratch, just put on your mittens and hike to Svalbard, right?

Or…you could just build your own seed bank. Granted weplanter beds of greens haven’t had 25 years to test our seeds to see if they’re still viable after a quarter of a century, but we have no reason to believe they wouldn’t be. With your own seed bank, you could establish or maintain a diverse garden for your family in case of emergency. Or, in case you just want to have your own, healthy, organic seeds. For example, a neighbor mentioned that she’d like to use her freeze dryer to preserve seeds from her flower garden for her granddaughters, who are still small. Imagine as an adult receiving heirloom seeds from your grandmother’s garden that were preserved while you were still a child. What a touching wedding, bridal or housewarming gift.

Freeze-dried seeds are easy to store, and easy to share and transport. They take up almost no room in the pantry. We recommend that you store them in Mylar bags with oxygen absorbers, just as you would your long-term freeze-dried foods. If you freeze dry seeds, let us know how it goes by sharing with the community on our Facebook page.


This is very interesting. How long were the seeds stored after freeze drying before they were reconstituted and used? I save seeds from the garden every year as well as purchasing seeds. If this process helps them last longer then the normal 2-5 year viability window it would be great to know. Anyone that does actual tests on this please post your details. Thanks

I want to know if the seeds were already dry before putting them in the freeze dryer or if they were pulled from the plant and immediately put into the freeze dryer. i will likely try both ways with my freeze dryer to test it out.


The article said that the seeds need to be normalized first by standard drying techniques and then freeze-dried.

I just wanted to drop a link here for everyone to reference. Someone actually tried getting a patent to do this commercially in 1973, with instructions and results listed on this page. They successfully tried flash-freezing as well as putting the seeds directly in the freeze-dryer. Not necessarily a brand new technique, but still relatively new, and from this patent information, is shown to produce healthier seeds than traditional drying methods.

Thank you for the link Becky! I read it and understood most of it at the “kinda-sorta” level. I think it said that the seeds need to be dried to the normally acceptable level of moisture before being freeze dried? I guess what I am trying to figure out is if I buy heirloom seed packets, and then freeze dried the seeds, when rehydrated thru planting, would they still be viable? Would it help to soak the seeds first or do I just need fresh seeds? Thanks to any and all that can enlighten me!

Hey Deb,

I am no expert but this is what the seed company told me at Fruition seeds: Drying seeds before any type of freezing Must be done or else the water/moisture content naturally found in the seed will freeze and the seed will be rendered unviable (dead). So Before freezing you would need to take your seed packets, open them up to the air and then place all of them in a gallon freezer bag standing upwards, then place a large desiccant pack from fruition seeds or enough oxygen absorbers inside the ziplock bag with them, expel the air inside the bag gently and leave that way for 3-4 Days to dry. Then you can carefully place them in the freezer for long term storage, or in this case, try to freeze dry them! 🙂 My FD is on order and I can’t wait to try this myself!!!

I am very interested in the idea of freeze drying seeds. I had a giant pumpkin last year that weighed perhaps somewhere on the order of 600 pounds. While this is nowhere near the record for giant pumpkins (2,624.6 pounds in 2016). I wanted to dry my pumpkin seeds. I made a mistake of bagging them to soon and they molded. All ruined. So, this year I am going to freeze dry my giant pumpkin seeds. What would be most helpful for me is info/suggestion on technique. Should I dry them as best I can before freeze drying?. Or, should I simply take the seeds directly from the pumpkin to the freeze drier?. Any suggestions would be greatly appreciated. Thanks very much for any and all suggestions and comments.

Is there an update to this experiment? It was done 4 years ago. Were any of those seeds stored longer? And tried another year?

Any updates on this Harvest Right staff? (with regards to if the seeds need to be partially dried first before being freeze dried?) thanks!

Seeds need a certain percentage of moisture content to remain viable. So I don’t see how freeze drying would preserve seeds for growing. (Horticulturist).

I would kike to know at what temperature the seeds were dried. I grow lots of my seeds, and this could be a total game changer for me.

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