Seed Saving
Which crops are worth saving seed from, which ones are a genuine multi-season project, and why.
Seed saving ranges from genuinely easy (self-pollinating crops like tomato, beans, peas, most herbs) to advanced multi-season projects (biennials like carrot, beetroot, cabbage that need a full cold winter before they'll even flower). Two things matter more than anything else:
Pollination type: self-pollinating crops rarely cross with other varieties and are the easiest starting point. Insect- or wind-pollinated crops can cross with other varieties of the same species growing nearby, which matters if you want seed that grows true to the parent plant next season.
Hybrid vs open-pollinated: seed saved from an F1 hybrid variety won't grow true to type, it may revert to one of its parent lines. Check the seed packet or supplier, open-pollinated (sometimes labelled "heirloom") varieties are the ones worth saving seed from.
Difficulty by crop
| Crop | Difficulty | Notes |
|---|---|---|
| Tomato | Easy | Self-pollinating, so seed usually comes true. Ferment the seed and pulp for 2-3 days to remove the germination inhibitor before drying. |
| Capsicum & Chilli | Easy | Self-pollinating but will cross with other capsicum/chilli varieties nearby, keep varieties 15m+ apart if seed purity matters. Save seed from fully ripe (coloured) fruit only. |
| Cucumber | Moderate | Cross-pollinates readily with other cucumber varieties via insects, isolate by distance or hand-pollinate. Let the fruit go well past edible, yellow and hard, before harvesting seed. |
| Zucchini & Pumpkin | Moderate | Both cross-pollinate within their species, isolate varieties or hand-pollinate for true seed. Pumpkin seed needs the fruit fully mature and stored a few weeks before extraction. |
| Green Beans | Easy | Self-pollinating and rarely crosses. Leave a portion of pods on the plant until they dry and rattle, then shell and store. |
| Peas | Easy | Self-pollinating, rarely crosses. Leave pods on the vine until they're dry and papery, then shell. |
| Lettuce & Salad Greens | Moderate | Self-pollinating but bolts fast once flowering starts, let a plant go to seed deliberately (it will look nothing like the eating stage). Seed is ready when the fluffy seed heads form, similar to a dandelion. |
| Silverbeet & Spinach | Moderate | Wind-pollinated and crosses readily between varieties of the same species, isolate by distance. Silverbeet is biennial in most climates, it needs a cold period before it will flower and set seed. |
| Kale | Moderate | Crosses with other brassicas (broccoli, cabbage, etc.) if flowering at the same time, isolate by distance or timing. Biennial, needs a cold period before flowering. |
| Carrot | Hard | Biennial (needs a cold winter before flowering) and wind/insect pollinated, crosses with wild carrot/Queen Anne's lace. A genuinely advanced seed-saving project, most home gardeners buy carrot seed. |
| Beetroot | Hard | Biennial and wind-pollinated, crosses with silverbeet and other beet varieties. Needs a cold period to flower, a multi-season, advanced project. |
| Potato | N/A (grown from tubers) | Save your own seed potatoes by setting aside small, disease-free tubers from the harvest, stored cool and dark. True botanical seed exists but isn't how home gardeners propagate potatoes. |
| Onion & Garlic | Hard for onion, easy for garlic | Garlic is propagated from cloves, save your biggest, healthiest cloves as next season's planting stock. Onion is biennial, insect-pollinated and crosses readily, an advanced project. |
| Broccoli & Cauliflower | Hard | Crosses with all other brassicas flowering at the same time (cabbage, kale, etc.), needs isolation. Biennial in most climates, a multi-season project. |
| Cabbage | Hard | Crosses with other brassicas, biennial, needs isolation and a cold period. Most home growers buy cabbage seed rather than save it. |
| Sweet Corn | Moderate | Crosses readily with any other corn variety flowering nearby, including field corn, isolate by distance or timing. Let cobs dry fully on the stalk before shelling for seed. |
| Basil | Easy | Self-pollinating, rarely crosses within reasonable garden distances. Let flower spikes dry fully on the plant, then rub the seed heads out. |
| Coriander, Parsley & Dill | Easy | All three self-pollinate readily. Let seed heads dry fully on the plant (coriander seed is also the spice), then collect before they shatter and scatter naturally. |
| Strawberry | Hard | Most home strawberries are grown from runners (clones), not seed, and named varieties don't come true from seed anyway. Propagate by pegging runners into pots. |
| Rhubarb | N/A (grown from crown division) | Rhubarb is propagated by dividing an established crown, not commonly grown from seed by home gardeners, as seed-grown plants are variable. |
How long does saved seed actually stay viable? See the reference table →