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of tomato.Choose open-pollinated tomato varieties (not F1 varieties as they may not come 'true'). It's also a good idea to save heritage, or rare varieties of tomato in this way, to preserve the seed for future generations.TomatoesKnifeGlass jar

and shape of its flowers.The day before you intend to pollinate your plant, cut at least one fully open flower from the father plant, making sure it has 2.5cm (1in) of stem. Bring this flower into the house and float it in a shallow bowl of water overnight

Alliums are spectacular plants and it's worth saving a few seeds to sow in the spring to grow some more for the garden. The seeds will germinate quickly and reach flowering size in a couple of years.SecateursPaper envelopesSeptember - October20

It's really easy to extract and sow seed from fruits you've collected, and it's also free. Plants grown from seed aren't always exactly like the parent plant, unlike those grown from cuttings, so look forward to results that could be new, different

the seedheads may be highly ornamental and can be left on the plants for their display, but checking them regularly to collect some of the seed once it's dry.SeedheadsSecateursPaper envelopes or paper bagsPenSeptember - October10 minutesWait for seeds to ripen