MikeD said:There are way too many variables surrounding your question for anyone to give a meaningful answer. For example, the biology of the seeds you are interested in, what is the length you are thinking of for "long term," what does "cheap" mean, etc. I can tell you, there really is no magic solution for stashing away a seed collection and hoping it all germinates in 5, 10, or 20 years.
Every seed will eventually lose its viability, that is their ability to germinate and grow. There are many factors that can contribute to this . . . genetic design, environmental storage conditions, etc.
The best way to look at it is that seeds are living organisms. They consist of a fertilized cell, a stored food source to get them going before they can 'take their first breath' (create their own food), and a life force. If they are stored properly, most can last for years. This does also depend on the seed type. Some species, like parsnips, are fragile and tend to lose viability after a year or two. Others, like the weedy wild amaranth species we have here in Oregon called 'Redroot Pigweed', can remain viable in the soil for decades.
The best thing that you can do for your seed is to store them in an airtight, not "airless", container, in a cold, dark place. Refrigerators are excellent. The worst conditions for seeds are fluctuating levels of temperature and humidity. These variations "wake up" the seed, causing it to consume its precious food reserve. This causes the seeds to become weak or lose viability altogether . . . they just don't have enough food remaining to grow into a plant.
Here is a link to a good document that describes an easy method for storing extra seed for future plantings. It is in PDF file format:
http://www.webgrower.com/infor...
And a couple of others that may be of interest to you:
http://www.webgrower.com/infor...
http://www.saveseeds.org/libra...
I also want to point out that even seed stored by the professionals at places like the Seed Savers Exchange and the National Seed Storage Lab, and all of their expensive gear and facilities, still need to regularly plant and save fresh seed to keep the variety viable.
I hope that this helps.
Best Regards,
Mike
tx_flower_child said:...but there's one thing I can't quite picture. What's the difference between 'airtight' and 'airless'? Maybe this might not matter much to the average home gardener. Sounds like it would require special equipment??
ZenMan said:
It might be a good idea to store the Ziploc bags in a Mason jar, to minimize the amount of gaseous diffusion through the thin plastic. And store the Mason jar in the refrigerator. No "special equipment" required.
tx_flower_child said:So . . . why bother with the Ziplock or any other plastic bag? Sounds like a 'belt and suspenders' solution. (Yes, I realize that this wouldn't work for storing more than one type of seed in a jar.)
tx_flower_child said:What about using paper packets, like those often used for coins, and placing them in the Mason jar? Or using the original package if unopened or if enough of it remains useable?I like to see inside the packet, so for me that eliminates the paper packet approach. You could use rice as a dessicant -- using dry rice seeds as a desiccant. Or your seeds themselves could be dry, and act as their own desiccant. That is the way the commercial seed companies do it. You don't get desiccant in your store-bought seed packets. I do save green seeds, which have moisture content when I save them, but I dry them before packaging them. Zinnia seeds are rather big, almost comparable to rice seeds. And my home hybridized zinnia seeds are considerably bigger than commercial zinnia seeds. Click the pics for bigger views.
Also, I've read that one should use a desiccant in the Mason jar. This could be a commercial version or homemade using either rice or powdered milk. Any thoughts on this aside from said Mason jar is starting to get crowded?