How to Start a Seed Swap in Your Neighbourhood

Most gardeners end every season with a drawer full of half used seed packets and a nagging feeling that they should share them. If you want to start a seed swap in your neighbourhood, the hard part is not the seeds. It is getting people through the door on the right day, with something to bring and a reason to stay and talk.

I have helped set up three swaps, one in a church hall, one on a library's front steps and one that now runs from a shelf in a cafe. Here is what worked, what flopped, and how to run your first one with almost no budget.

Why start a seed swap at all

A packet of tomato seeds can cost 3 or 4 pounds and contain 30 seeds, when most home growers need six plants. Multiply that across beans, squash, herbs and flowers, and a small garden can easily waste 40 pounds of seed a year. A swap moves that surplus to someone who will actually sow it.

There is a bigger benefit too. Seeds saved locally are often from plants that already cope with your soil and weather. Over a few years, a swap builds a small library of varieties that suit your streets, from a runner bean that a retired neighbour has grown since the 1970s to a calendula that self seeds in every crack.

And it brings people together across the garden fence. In our experience, about half the people who come to a seed swap are not serious gardeners at all. They come because it is a friendly, free thing to do on a Saturday morning.

Choosing the date, place and format

Timing matters more than anything else. Late February to mid March works best in most of the UK, because people are planning but have not sown yet. A second, smaller swap in September catches seeds that have just been saved.

Where to hold it

You need a few trestle tables, shelter from rain and somewhere easy to find. Good options include:

• A library, which often lends space free for community events
• A church or community hall, usually 10 to 25 pounds for a morning
• A school entrance at pickup time
• The corner of a community garden or allotment site

Picking a format

The simplest is the open table. Everyone puts their seeds out, sorted by type, and takes what they want. You do not need strict "bring one, take one" rules. In every swap I have run, generous people bring far more than they take and newcomers who bring nothing still leave with a handful. That is fine. It is how new gardeners become regulars.

What you need before the day

A first swap for 30 to 50 people can be run for under 20 pounds. My checklist:

1. Small envelopes. Buy 200 plain coin envelopes for around 5 pounds. People will repack seeds from big packets.
2. Labels and pens. Every envelope should show the plant, the variety, the year saved and the donor's first name.
3. Category signs. Vegetables, herbs, flowers, and a box marked "mystery" for unlabelled seeds.
4. A starter stock. Ask a local garden centre or allotment society for out of date packets. Seeds a year or two past the date usually still germinate well.
5. A sign up sheet. Collect email addresses so you can invite people next time.

Spread the word two to three weeks before through school newsletters, library boards and local groups. A printed poster on a community noticeboard still reaches people that online posts miss, especially older growers with the best saved seed.

Running the swap on the day

Set up 45 minutes early. Lay out the tables by category and put the envelopes and pens at one end so people can repack as they go.

Give the event a two hour window, for example 10am to 12pm. Most people arrive in the first 40 minutes, so have at least two helpers at the start. One should greet people and explain how it works in a sentence. The other should keep the tables tidy, because a messy table puts newcomers off quickly.

Add one small extra and attendance grows the next year. A tea urn and a plate of biscuits, a table of spare seedlings, or a 15 minute talk on saving tomato seed all work. The talk gave us our best turnout, and it cost nothing because a member of the local allotment society was happy to speak.

The rule I stopped enforcing

A lot of seed swap guides tell you to accept only open pollinated or heirloom seed and to refuse anything labelled F1. The reasoning is that F1 hybrids do not breed true, so their saved seed gives unpredictable plants.

That reasoning is correct for saved seed but wrong for leftover packets. A shop bought F1 packet will grow exactly what it says on the label. Turning those packets away just sends them to the bin and makes newcomers feel they got something wrong. Our approach now is simple. Accept everything, but label saved seed from F1 plants as "may not come true" so nobody is disappointed later.

The rule that does matter is honesty in labelling. If you do not know what something is, it goes in the mystery box.

Keeping it going after the first year

A swap that runs once is a nice morning. A swap that runs every spring becomes part of the street. To keep it alive:

• Fix the date, such as the first Saturday in March, so people remember it
• Leave a permanent seed tin in the library or a cafe between swaps
• Ask regular donors to save seed from one plant each autumn
• Pass the organising role around so it does not rely on one person

If you already help with a community garden, it is the natural home for a seed swap, with growers on hand and space to show what the seeds become.

Frequently asked questions

Do I need permission to run a seed swap?

For a free swap of home saved or leftover seed between private gardeners, you generally do not need a licence. You will need permission from whoever owns the venue. If you plan to sell seed or charge entry, check with your local council first.

How old can seeds be for a seed swap?

Many seeds stay viable for three to five years if kept cool and dry, including tomatoes, squash and brassicas. Parsnip, onion and some herbs lose viability within a year or two. Labelling the year helps people decide.

What if nobody brings seeds to the swap?

Build a starter stock in advance by asking garden centres, allotment societies and keen gardeners for spare packets. A well stocked table at the first swap gives people confidence to bring their own next time.