The short version: Open-pollinated seed comes from plants pollinated naturally and grows true to type, so you can save it year after year; heirloom seed is open-pollinated seed with a long history. Hybrid or F1 seed is the first generation of a deliberate cross between two parent lines, bred for uniformity, vigour or disease resistance; it grows perfectly well, but seed saved from it will not repeat the parent, so you buy it fresh each season. Genetically modified seed has had genes altered in a laboratory, is tightly regulated in Australia, and is not sold to home gardeners at all. None of the four is a trick; they are tools for different jobs, and the packet tells you which one you are holding.
Seed packets carry words that sound like marketing and are actually precise: open-pollinated, heirloom, F1, hybrid, and occasionally the reassurance that a range contains no GMO seed. Knowing what each one means changes how you grow, whether you can save seed, and what to expect from the plant. Here is the plain-language version.
Open-pollinated seed
Open-pollinated varieties are pollinated by wind, insects or by the flower itself, without a breeder controlling the cross, and have been selected over enough generations that the offspring resemble the parents closely. Sow a packet of an open-pollinated lettuce and you get that lettuce, with a little natural variation from plant to plant. That variation is a feature: it spreads the harvest window a little, and it lets a variety adapt gradually to your soil and climate if you save seed from the plants that do best. Open-pollinated seed can be saved indefinitely as long as varieties of the same species are kept from crossing.
Heirloom seed
An heirloom is an open-pollinated variety with a lineage, one that has been maintained and passed on for decades or longer, often within a family, a region or a community. A common rule of thumb is fifty years or more, but there is no official Australian definition or register, so "heirloom" on a packet is a description of history rather than a certified standard. Every heirloom is open-pollinated; not every open-pollinated variety is old enough to be called an heirloom. Heirlooms carry the flavours, colours and shapes that commercial breeding left behind, which is their appeal, and they can also carry less bred-in disease resistance than modern varieties, which is the trade. Whether they always taste better is a matter of opinion, and growing conditions and ripeness matter more to flavour than the label does. Our guide to heritage vegetables worth rediscovering picks some of the best.
Hybrid and F1 seed
A hybrid is the deliberate cross of two different parent lines of the same species. In an F1 hybrid, the breeder first inbreeds each parent line for several generations until it is uniform and predictable, then crosses the two, and the seed from that cross is sold as F1, meaning first filial generation. The offspring are remarkably uniform and often show hybrid vigour, growing bigger and yielding more than either parent, and the breeder can combine traits such as disease resistance from one parent with flavour or earliness from the other. Because the cross must be made afresh every season, often by hand, hybrid seed costs more.
The catch is the second generation. Seed saved from an F1 plant does not carry the same tidy combination; it segregates into a random assortment of the grandparents' traits, most of them less useful than the hybrid, so gardeners who want the same plant buy fresh seed each season. Two myths are worth killing. Hybrid seed is not sterile: it germinates and grows normally, it just does not come true. And a hybrid is not a genetically modified organism; it is made by ordinary pollination within a species, the same thing bees do, only chosen by a person. Our guide to F1 and F2 hybrid seeds goes further, from how breeders make the cross to what the second generation does.
Genetically modified seed
A genetically modified organism has had its genetic material altered directly in a laboratory, by inserting, deleting or editing genes, sometimes from an unrelated species. In Australia, every GM organism needs approval from the Commonwealth Office of the Gene Technology Regulator after a health and environmental risk assessment. The GM crops approved for commercial growing are broadacre farm crops: cotton and canola have been grown for many years, and safflower, Indian mustard and a banana have been added more recently, along with some GM carnations grown as cut flowers. The state moratoria that once blocked GM crops have mostly been lifted; South Australia's mainland ban ended in 2020, with Kangaroo Island keeping its GM-free status at the time, while Tasmania still maintains one. What matters to a home gardener is simpler: no GM vegetable, herb or flower seed is sold to Australian gardeners, so the tomato, corn or pumpkin seed in your hand is not GM, whatever the packet does or does not say. The so-called terminator gene, a patented technology designed to make second-generation seed sterile, has never been sold to gardeners either. Newer gene-editing techniques that make small changes without adding foreign DNA are regulated differently and are a specialist topic well beyond the seed rack.
Which should you grow?
There is no wrong answer, only a fit for the job. Choose open-pollinated and heirloom seed when you want to save your own seed, when flavour and variety matter more than uniformity, when you are growing for a market that values the unusual, or when you simply like the story. Choose an F1 hybrid when you need reliable disease resistance in a humid climate, an early crop in a short season, uniform plants for a tidy bed, or the highest yield from limited space, and when you are happy to buy seed each year. Many gardeners grow both: an heirloom tomato for the table and a hybrid cherry that shrugs off disease and crops until May. Our own range includes both, sold under separate collections so you can see at a glance which is which.
Reading the packet
- F1 or hybrid: do not save the seed expecting the same plant.
- Open-pollinated or OP: seed can be saved and comes true if the variety is kept from crossing.
- Heirloom or heritage: open-pollinated with a history; a description, not a certification.
- Certified organic: grown and processed under an organic standard; says nothing about hybrid or open-pollinated status.
- Untreated: no fungicide or insecticide coating on the seed, which matters for sprouting and microgreens.
- Non-GMO: true of all home garden seed in Australia, so treat it as reassurance rather than a distinction.
Seed types across Australia's climate zones
- Tropical (Cairns and far north Queensland, Darwin and the Top End of the Northern Territory, the Kimberley in Western Australia): disease pressure is high, so hybrids bred for resistance earn their price for tomatoes and cucurbits, while locally adapted open-pollinated tropical varieties suit the wet season.
- Subtropical (Brisbane and coastal Queensland, Coffs Harbour and northern New South Wales): a mix works well; heirlooms for the dry-season garden and resistant hybrids for summer.
- Arid and semi-arid (inland Queensland, Broken Hill and Dubbo in New South Wales, Mildura in Victoria, inland South Australia and Western Australia, Alice Springs in the Northern Territory): open-pollinated seed saved from your own toughest plants adapts to heat and dryness season by season.
- Temperate (Sydney and New South Wales, Melbourne and Victoria): the widest choice; heirlooms thrive, and hybrids help mainly with early cropping and disease in a wet summer.
- Mediterranean (Perth and southern Western Australia, Adelaide and the Adelaide Plains in South Australia): the dry summer suits heirloom tomatoes and capsicums; hybrids are optional.
- Cool and alpine (Hobart and Tasmania, Canberra and the ACT, Ballarat in Victoria, Orange and Armidale on the New South Wales tablelands, and the alpine country of the Snowy Mountains and the Victorian high country): early hybrid tomatoes and corn can be the difference between a crop and none in a short season, while saved open-pollinated seed of peas, beans and brassicas adapts well to the cold.
In every zone, the packet label is the first thing to read and the last thing to worry about.
Frequently asked questions
Is hybrid seed sterile?
No. It germinates and grows normally. Seed saved from the hybrid plant simply will not reproduce the same variety.
Are hybrids genetically modified?
No. A hybrid is made by controlled pollination between two parents of the same species, with no laboratory alteration of genes.
Can I buy GM seed for my garden in Australia?
No. GM crops approved here are broadacre farm crops grown under licence. No GM vegetable, herb or flower seed is sold to home gardeners.
Do heirlooms always taste better?
Often, but not always. Many were kept for flavour, which shows. Ripeness, variety choice and growing conditions matter at least as much as the label.
Open-pollinated for saving and variety, hybrid for uniformity and resistance, and nothing on the home garden rack is GM: that is the whole vocabulary. The Office of the Gene Technology Regulator at ogtr.gov.au publishes the current list of approved GM crops if you want the official picture.
Related growing guides
- Hybrid F1/F2 Seeds for Sustainable Gardening
- Forgotten Heritage Vegetables Worth Rediscovering from Seed
- How long do seeds last? Storing seeds and testing if they still grow
- San Marzano vs Beefsteak vs Heirloom Mix: Choosing the Right Tomato
Choose by the job: browse our heirloom seeds, hybrid vegetable seeds and the full range of vegetable seeds.