Key takeaways
- F1 hybrids come from crossing two parent lines, so plants are even and vigorous
- Seed saved from an F1 plant won't grow the same variety again
- Open-pollinated seed grows true, so you can save your own year after year
- Heirloom varieties are old open-pollinated types, often grown for flavour
- Pick F1 where disease resistance matters, such as blight or clubroot
- Look for "F1" after the variety name on the packet
F1 hybrid seed is a cross of two chosen parent plants, bred for even, vigorous growth. Open-pollinated seed grows true, so you can save your own year after year. Both earn a place in a UK veg patch. The right one depends on the crop and on whether you plan to save seed.
This guide helps you choose when you’re buying seed. If you already know you want to save your own, the guide to seed saving for beginners takes you through it crop by crop.
What does F1 hybrid mean?
An F1 hybrid is the first generation of a cross between two parent lines. Breeders keep each parent line pure and stable. They then cross the two, often by hand, and the seed from that cross is the F1.
What you get from the packet:
- Vigour: plants often grow stronger than either parent
- Evenness: nearly every plant looks and crops alike
- Tight timing: crops tend to come ready together
- Disease resistance: often bred in from one of the parents
The cross has to be made fresh every year, so F1 seed costs more and packets often hold fewer seeds.
What do open-pollinated and heirloom mean?
Open-pollinated plants are pollinated naturally, by insects, wind or their own flowers. Seed saved from them grows the same variety again, as long as it hasn’t crossed with a different variety nearby.
Heirlooms come in every shape and colour going. Save seed from your favourites and they’ll come back true next year.
Heirloom (or heritage) varieties are old open-pollinated types handed down over many years. They’re often grown for flavour, colour or a bit of history. The Heritage Seed Library run by Garden Organic looks after many old varieties you can’t buy in shops.
What open-pollinated gives you:
- Free seed you can save yourself
- A huge choice of old, unusual and local varieties
- A little more variation between plants, which matters less in a home garden
F1 vs open-pollinated at a glance
| F1 hybrid | Open-pollinated | |
|---|---|---|
| Price | Usually higher, fewer seeds | Usually lower, more seeds |
| Save your own seed | Won’t come true | Grows true if kept apart from other varieties |
| Evenness | Very even | Some natural variation |
| Disease resistance | Often bred in | Depends on the variety |
| Choice | Mostly modern varieties | Modern, old and rare |
F1 and open-pollinated seedlings look the same on the windowsill. The difference shows later, in how even the crop is and whether saved seed comes true.
When F1 hybrid seed is worth it
Choose F1 when disease resistance or an even crop really matters. That extra cost can save a whole crop in a bad year.
- Outdoor tomatoes, where blight-resistant F1s such as Crimson Crush stand a better chance. See the guide to blight-resistant tomato varieties
- Brassicas on ground with clubroot, where resistant F1 varieties exist
- Courgettes and cucumbers, where some F1s resist mosaic virus
- Brussels sprouts, where F1s give even buttons up the stem
- Show crops, where matched, uniform produce wins prizes
An even row of hybrid cabbages beside more varied kale. F1s shine where you want a matched crop or bred-in resistance.
When open-pollinated seed is the better choice
Choose open-pollinated when you want to save seed, spend less or grow something unusual.
- Peas, French beans, lettuce and tomatoes are the easiest to save, as their flowers mostly pollinate themselves
- Heritage varieties often aren’t sold as F1 at all
- Flavour-first crops, such as many old tomato varieties
- Tight budgets, as saved seed is free
Tomatoes are one of the easiest crops to save seed from. Just make sure the variety is open-pollinated, not F1.
Squash, sweetcorn, brassicas and runner beans cross easily with other varieties nearby. To save true seed from these, grow only one variety or cover and hand-pollinate the flowers.
Why saved F1 seed won’t come true
Seed from an F1 plant gives a mixed bag. When an F1 plant sets seed, the traits of its two parents shuffle. The next generation, called F2, varies widely. Some plants look like one grandparent, some like the other, and many like neither.
You can grow F2 seed for fun, but don’t expect the variety you started with. It’s simpler to buy fresh F1 seed each year. For crops you want to keep going, grow an open-pollinated variety and save from your best plants.
How to tell F1 from open-pollinated on the packet
Look for “F1” after the variety name. If it’s there, the seed is a hybrid. Sungold F1 is a hybrid tomato, while Gardener’s Delight is open-pollinated. If there’s no “F1”, the variety is almost always open-pollinated. Words like “heirloom” or “heritage” point to an old open-pollinated type.
Common mistakes when choosing seed
- Saving seed from an F1 plant and expecting the same variety next year
- Paying F1 prices for easy crops such as radishes or lettuce, where open-pollinated seed does the job
- Saving squash or sweetcorn seed without keeping varieties apart, then getting odd crosses
- Assuming heirloom always tastes better. Flavour depends on the variety, not its age
For tomato choices, see the best tomato varieties for the UK. The guide to sowing seeds indoors covers trays, compost and light, and there are more crop guides on the growing veg hub.
Now you’ve picked your seed, use the seed sowing calendar to plan what to sow each month.
Frequently asked questions
What is the difference between F1 and open-pollinated seeds?
F1 seed is a cross of two parent lines; open-pollinated seed grows true. F1 plants are even and vigorous, but their saved seed won’t give the same plant. Open-pollinated plants vary a little more, yet their saved seed grows the same variety again.
Can you save seed from F1 hybrid plants?
You can, but it won’t grow true. The next generation is a mix of the grandparents’ traits, so plants are unpredictable and often poorer. If you want to save seed, grow an open-pollinated variety.
Are F1 hybrid seeds worth the extra money?
Often, for crops where disease resistance matters. Blight-resistant tomatoes, clubroot-resistant brassicas and virus-resistant courgettes can save a crop in a bad year. For easy crops or seed saving, open-pollinated is fine.
Is open-pollinated the same as heirloom?
All heirlooms are open-pollinated, but not all open-pollinated seed is heirloom. Heirloom usually means an old variety handed down over many years. Open-pollinated just means it grows true from saved seed, whatever its age.
Do F1 or open-pollinated seeds taste better?
Neither wins on flavour by default. It comes down to the variety. Sungold is an F1 tomato loved for its sweetness, while many heirlooms are grown for flavour too. Choose by the named variety, not the type.
Our team produces practical UK gardening guidance from source research, contributor records and established horticultural practice. Editorial standards are overseen by Matt W.
