Leftover seeds: an autumn stocktake before buying more

An open radish packet, an undated envelope and several similar lettuce varieties can spend a whole season in a drawer. In spring they reappear just after replacements have been bought. An autumn stocktake helps establish what remains, what you know about it and which future sowings need new seed.

Do not begin by throwing away everything old. A packet's age is only part of the picture. The plant, storage history and surviving instructions matter too. The objective is a small, understandable supply, not a declaration that every seed will germinate.

Keep the seed connected to its information

Spread packets on a dry table away from food. Keep batches separate even when their variety names match: they may have been stored differently. Preserve the original packaging, including the instructions on the reverse. A damaged packet can go inside a labelled outer envelope together with its contents.

For each batch, record the crop, variety, purchase or collection year, approximate amount and condition of the packet. Mark an unknown date as unknown. Do not identify a variety from the appearance of loose seed. An unlabelled envelope should not enter your ready-to-sow collection under a confident but guessed name.

Retain the manufacturer's warnings for treated seed. Sowing seed is not intended for eating or producing food sprouts. Follow its handling instructions and store it separately from food, children and pets. Important information should remain accessible even if you add a new outer container.

Sort according to the next decision

Try three groups: “information available”, “needs clarification” and “not planned for the main sowing”. The first contains identifiable batches with a known history. The second contains questions about conditions or instructions. Unidentified or visibly spoiled leftovers can be kept out of your main planting plan.

These are working labels, not official quality grades. A packet in the first group does not promise a harvest; you simply have enough information to take the next step. If only a few expensive seeds remain, do not automatically use a large proportion for a trial. Decide what you need to learn and how much of the supply you can afford to use.

Also mark crops you do not intend to grow next season. Keeping something “just in case” is more useful when you know what that case might be. If you pass seed to another gardener, explain the known age and storage conditions. Do not describe untested germination as a guaranteed property.

Match storage to the plant

For many dry seeds, RHS recommends labelled paper packets in an airtight container with a desiccant. It also notes that some species lose viability with storage and are better sown promptly. There is consequently no universal storage period for every seed: retain species-specific and manufacturer instructions.

For household organisation, a consistent location matters more than an elaborate system. Label the outer box and separate crops with dividers. Avoid a place exposed to splashes or sharply changing conditions. Any desiccant sachet should remain separate, intact and inaccessible to children.

Do not hide a damp or suspicious-smelling packet among the others. Isolate it and investigate its condition. Attractive replacement packaging does not resolve uncertainty about the contents. Your box should make unfinished decisions visible rather than conceal them.

When a small trial sowing is useful

For an identified batch that raises doubts, you can sow a small counted sample in advance, following that crop's instructions. Choose seed with known requirements for depth, light and temperature. If a species needs special preparation, simply omitting it will not produce a meaningful trial.

Record the number of seeds, the date and the conditions. Note emergence during the period appropriate to the crop. Waiting the same number of days for every species is not a useful comparison. If the growing medium dried out or conditions changed, record that as well: the outcome reflects your procedure as well as the seed.

An illustrative note might read, “I sowed 10 seeds and 7 emerged under these conditions.” It does not guarantee 70 per cent emergence from the whole batch in a spring garden bed. A small sample provides a limited observation. Keep a backup for an important planting instead of planning the entire bed around an apparently precise prediction.

Make purchases answer a planting need

After sorting, list the actual gaps. Beside each proposed purchase, write the intended sowing location and the number of plants or rows you want. Keep experiments separate so you can see what additional space you are willing to give them. A small packet should not quietly turn into a gardening project for which you have no room.

In spring, begin with the inventory and another check of storage conditions. An autumn review does not remove the need to inspect again. Its result is a supply with identifiable origins, visible unanswered questions and purchases that meet a real need rather than duplicate a forgotten drawer.