Seed Saving September: The Rewarding Autumn Job That Saves Money Too
As the growing season slows and autumn edges in, many allotments are filled with plants going to seed. While it might be tempting to clear everything away, September is the perfect month to pause, take stock, and save seeds for next year.
Not only does seed saving cut costs, but it also helps you build resilience in your plot — plants adapt to your local soil and climate over time, and there’s something deeply satisfying about growing from seed you harvested yourself.
In this post, we’ll cover why seed saving matters, which seeds to focus on in September, how to collect and dry them properly, and the best ways to store them.
Why Save Seeds in September?
- End of season timing: Many crops naturally produce mature seed heads around this time.
- Dry weather (if we’re lucky): September often offers the last dry spell for harvesting before autumn rain sets in.
- Next year’s savings: By saving seeds now, you’ll cut down on what you need to buy when catalogues arrive in winter.
SEO Keyword: Seed Saving September
Which Seeds Can You Save This Month?
Here are some reliable crops to harvest seed from in September in the UK:
- Beans and Peas – Leave pods on the plant until they are dry and brittle.
- Tomatoes – Scoop seeds from ripe fruits, then ferment for a few days to remove the gel coating.
- Lettuce – Collect fluffy seed heads as they dry.
- Sunflowers – Harvest heads when the back of the flower turns yellow/brown.
- Herbs (Coriander, Dill, Parsley) – Allow some plants to flower and set seed.
- Marigolds and Calendula – Deadhead once seed heads turn brown and papery.
How to Collect Seeds
- Choose Healthy Plants – Always collect from strong, disease-free specimens.
- Wait for Maturity – Seeds should be fully ripe and dry before harvesting.
- Pick on Dry Days – Avoid damp mornings or rainy conditions; moisture can cause mould.
- Label Immediately – Nothing is more frustrating than a jar of “mystery seeds.”
Affiliate slot: Use a sharp pair of snips or scissors to cut seed heads cleanly without damaging plants.
How to Dry Seeds Properly
Drying is essential. Damp seeds won’t store and may rot.
- Spread seeds in a single layer on mesh drying racks or a tray lined with kitchen paper.
- Keep in a warm, airy space out of direct sunlight.
- Stir or shake daily until seeds feel hard and brittle.
Storing Your Saved Seeds
Once seeds are fully dry, proper storage keeps them viable for longer:
- Use resealable paper seed envelopes — paper allows airflow and reduces mould risk.
- For larger collections, organise by crop type in a metal seed storage tin with dividers.
- Always store in a cool, dark, and dry place. A cupboard in the house is better than a damp shed.
Label each envelope with crop, variety, and date. Most seeds remain viable for at least 2–3 years, though germination rates decline over time.
Common Mistakes to Avoid
- Harvesting too early: Seeds must be mature to germinate next year.
- Forgetting to isolate crops: Some plants (like squash and brassicas) cross-pollinate easily, so you may not get “true to type” seed.
- Skipping labelling: A month later, all dried seeds look surprisingly similar.
Why It’s Worth It
Seed saving isn’t just about money — though that’s a nice bonus. It’s about:
- Preserving heritage varieties.
- Developing crops that thrive in your specific soil.
- Deepening your connection to the rhythm of growing.
There’s a sense of continuity: one season feeds the next, not just in food, but in seeds too.
Final Thoughts
Taking time for seed saving in September ensures next year’s allotment is rooted in this season’s success. With the right tools, a bit of patience, and good storage, you’ll have a treasure trove of seeds ready to sow when spring returns.
