Understanding Seed Types

Open-Pollinated Seeds

Open-pollinated (OP) seeds are produced by natural pollination — by wind, insects, or the plant itself — between plants of the same variety. When grown out, open-pollinated seeds produce plants true-to-type: the next generation looks and performs like the parent. This means you can save seed from open-pollinated varieties year after year, selecting over time for characteristics that suit your soil, climate, and taste.

Open-pollinated varieties are the foundation of seed saving and the preservation of agricultural biodiversity. Many have been selected over hundreds of years in specific regions and carry remarkable adaptations.

F1 Hybrid Seeds

F1 hybrids are produced by crossing two carefully selected parent lines under controlled conditions. The first-generation (F1) offspring show "hybrid vigour" — they are often more uniform, faster-growing, and higher-yielding than either parent. However:

• F1 seeds cannot be saved reliably. If you collect seed from an F1 plant, the offspring will revert to unpredictable combinations of the grandparent traits — not the variety you grew.
• F1 varieties are replanted each year from commercially produced seed, creating dependency on seed companies.
• Many F1 varieties are bred for commercial growing conditions: uniformity of size and ripening, shelf life, resistance to mechanical harvesting — not for flavour or nutritional density.

Heirloom Varieties

"Heirloom" has no strict legal definition but generally refers to open-pollinated varieties that are old — typically pre-1950 — and have been maintained by gardeners, seed libraries, or specialist companies. Many heirloom tomatoes, beans, and squash offer flavours unavailable in commercial varieties. They are more genetically diverse than modern commercial crops.

Organic Seed

Organic-certified seed has been produced without synthetic pesticides or fertilisers. Regulations in many countries now require organic growers to use organic seed where it is available. Using organic seed supports the organic seed supply chain.

Saving Your Own Seed

Saving seed from open-pollinated varieties is simple for self-pollinating crops (tomatoes, beans, peas, lettuce) and slightly more involved for cross-pollinating crops (brassicas, courgettes, beetroot) which need isolation from other varieties. Seed saving:

• Reduces cost
• Allows selection for local conditions
• Preserves genetic diversity
• Creates a personal seed collection tailored to your garden