How Long Do Seeds Last?

Seed Catalogs
Robin Sweetser

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How long do garden seeds last? How do you tell if your old seeds are still good? Let’s find out!

Wintertime is the season when these questions matter. The gorgeous seed catalogs arrive in the mail, tempting you with beautiful photographs.

But before you go crazy, it’s time to inventory your leftover seeds to avoid duplication.

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How Long Do Seeds Last?

Some seeds have a longer life expectancy than others. Most last for a couple of years if stored in a dry, cool place.

  • I have learned from experience that onion seeds are not much good after the first year but tomato, cucumber, and melon seeds can last 5 years or more.
  • Brassicas and squash seeds are good for 4 to 5 years.
  • Parsley, sweet corn, leeks, parsnips, shallots, and chives require fresh seed every year.

Seeds are living things and their viability is affected greatly by the way they are stored. Most experts agree on dark, cool, and dry conditions as being the best. We keep some of our seeds in the refrigerator but most are in open boxes in the dining room, probably not the best location.

How to Tell If Your Seeds Are Still Good

If I have a question about the viability of some seeds, such as those beans that someone gave me that they had kicking around since 2012, I will test a few.

This is as easy as placing ten seeds on a damp paper towel, folding it up, and placing it in a plastic bag. Put the bag in a warm spot and check after a week or so to see if any of the seeds have sprouted.

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  • 2 out of 10 means 20% germination—not too good, so I would just sow them more thickly than usual when planting or buy fresh seeds.
  • If 8 out of 10 germinate that means 80%—not bad at all and I can get away with using them for another season.

Once you have determined what you need, you can shop with a clear plan in mind and be less likely to overbuy.

Have fun perusing the catalogs and dreaming of your best garden ever. Summer is just a page away in a seed catalog!

 

 

About This Blog

Get inspired by Robin Sweetser's backyard gardening tips. Robin has been a contributor to The Old Farmer's Almanac and the All-Seasons Garden Guide for many years. She and her partner Tom have a small greenhouse business and also sell plants, cut flowers, and vegetables at their local Farmer's Market.

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Seed Inventory Time

Some of my leftover seeds, or seeds that I garnered from a previous crop, may germinate but seem to develop deformed plants or fruit. This is usually beans, corn, or peppers. Could this be due to them being hybrids?

Hi Mel,

Hi Mel,

If the seeds you saved are from hybrids they rarely will produce a plant that is like the parent. You could get something wonderful but usually it is a mutant throwback to a distant relative. To have any success with saving seeds look for plants that are heirlooms or open-pollenated. They will produce a plant that is the same as the parent. That said you do have to be careful of plants within the same species cross-pollenating - squash with gourds or one variety of tomato with another - those crosses sometimes result in a surprise! Your old seeds should not grow a deformed plant unless they have been damaged.

Rosemary plant

I have a rosemary plant that was blooming in a big pot until the cold weather, it's now in my garage, still looking and smelling like rosemary. How do I save it? Bring it indoors? Break up into smaller plants? Please advise. Thanks.

You must be psychic! I was

You must be psychic! I was planning on writing about wintering over rosemary next week! Here is my advice in a nutshell. Rosemary likes it cool and bright. If your garage does not fall below freezing and has a south window that gets lots of sun, you could leave it out there. Just be sure to water it when the soil feels dry. Don’t let it stand in water or the roots will rot. If your plant has more than one stem, it could be divided. During the winter rosemary is fairly dormant so don’t expect a lot of new growth. If the new growth is lanky it indicates that the plant is not getting enough light. If you need to winter it over in the house, place it in the coolest room near the brightest window. An unheated sunroom often works well as long as it doesn’t get below freezing at night. I occasionally wrestle my plant into the tub and turn on the shower to give it a good taste of rain. Misting will also help to hydrate the plant and discourage pests from setting up camp.

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