Can You Still Plant Old Seeds? Experts Reveal If Expired Packets Are Worth Using

As spring arrives, countless gardeners find themselves rummaging through old seed packets, debating whether to take a chance on those that have passed their 'sow by' date. This common dilemma sparks questions about viability and waste in the gardening community.

Expert Insights on Seed Expiration Dates

Huw Richards, a grow-your-own expert, author and popular YouTuber with more than 750,000 subscribers who works alongside hand-tools brand Gardena, confesses he's willing to take risks when it comes to various aspects of gardening. "Seed packets are just guidelines. At the end of the day, a seed either wants to grow or it doesn't," he states plainly.

Richards draws a parallel to supermarket practices, explaining: "I think it's a bit like what's happened with supermarkets, so they've got rid of a lot of best-before dates for vegetables because it's purely a thing of a guarantee, yet if that time elapses, they may still be perfectly fine to eat."

How Long Do Seeds Actually Last?

Seeds naturally deteriorate over time, and the Royal Horticultural Society warns that older seeds may yield disappointing results, potentially forcing you to restart with fresh stock. The longevity of vegetable seeds varies considerably, largely influenced by storage conditions.

Here's what you need to know about seed viability:

Cucumbers, tomatoes, pumpkins and radishes can remain usable for more than five years
Onions, spinach and parsley typically lose viability within one or two years
Certain vegetable seeds remain viable for two years, whilst others can last up to five years or beyond
As time marches on, the germination rate drops and they may lack the vigour of plants grown from fresh seeds

Testing Seed Viability Before Planting

If you're tempted to try planting old seeds, experts recommend conducting a germination test first. Heirloom seed company She Grows Veg suggests placing several seeds between moist paper towels, keeping them warm and monitoring for sprouting. If the majority germinate, they're still suitable for planting.

Richards offers practical advice: "If you've got a load of seeds left over, just sow four or five in a pot. And if any come through, you think, Oh, actually, there's life in this seed packet yet." This approach of double sowing can increase your chances that at least some will germinate.

Real-World Experiences with Expired Seeds

Matthew Appleby, editor of Horticulture Week, reports he's planted expired seeds with mixed results. "They can work. It's kind of like a sell-by date on a supermarket packet that they are there for safety reasons rather than practical reasons," he explains.

"I've grown pumpkins and courgettes from 'used by' seeds and I have had success but it's a bit more hit and miss," he notes. "It's worth having a go, but don't expect so much success."

Proper Storage Techniques for Seed Longevity

If you've only planted half a packet of seeds because you don't require too many plants or you lack space to sow more, improve your chances of them remaining viable through proper storage.

Richards advises: "I would say pop them into an old ice cream tub with a lid. Fold up the seed packet and put them in there or even in a cardboard box, in a cool, dry cupboard in your house."

Key storage considerations include:

Ensure there's no dampness accumulating in whichever container you're using
Include desiccants such as rice in your storage vessels to soak up excess moisture
Alternatively, opt for an airtight glass container to maintain their freshness
Store seeds somewhere cool, dry and dark

Appleby suggests you can simply secure an opened seed packet with a peg or tape for those bought in resealable packaging. When asked if opened packets yield poorer results, he responds: "Theoretically, but at the same time, it's more to do with the skill of the gardener when sowing, using the right temperature, the right potting medium, the right water etc."

Ultimately, while seed packets provide helpful guidelines, many expired seeds still contain life and can produce successful crops with proper testing and care. The decision to plant old seeds comes down to balancing potential waste against the joy of watching something grow against the odds.