Walk into any garden centre or browse any seed catalogue and you'll encounter two camps: heirloom seeds and hybrid seeds. Both will grow plants. But they're not the same — and understanding the difference can change how you garden, what you grow, and why it matters.
What Are Heirloom Seeds?
Heirloom seeds are open-pollinated varieties that have been passed down through generations — often for 50 years or more. They breed true, meaning the seeds you save from this year's harvest will produce plants identical to the parent. They carry history, flavour, and genetic diversity that modern breeding has often traded away in pursuit of uniformity.
At Diamond Field Blooms, we're passionate about heirloom and non-GMO varieties precisely because of this. These are seeds with a story.
What Are Hybrid Seeds?
Hybrid seeds (often labelled F1) are the result of controlled cross-pollination between two parent varieties. The goal is to combine the best traits of each — disease resistance, higher yield, uniformity of size or colour. They often perform exceptionally well in their first generation.
The catch: seeds saved from hybrid plants won't reliably reproduce the parent. Each year, you're back to buying new seeds.
Which Should You Choose?
The honest answer is: it depends on what you value.
- Choose heirloom if you want to save seeds, grow rare or unusual varieties, prioritise flavour and biodiversity, or simply want to know exactly what you're growing.
- Choose hybrid if you need consistent results, are growing commercially, or want maximum disease resistance in a specific crop.
For most home gardeners and flower growers, heirloom varieties offer something hybrids simply can't: a connection to the plant's history and the satisfaction of a garden that's truly your own.
Non-GMO: What It Actually Means
It's worth clarifying: both heirloom and hybrid seeds can be non-GMO. GMO (genetically modified organism) refers to laboratory-level genetic modification — something entirely different from traditional cross-breeding. All our seeds at Diamond Field Blooms are non-GMO, whether heirloom or otherwise.
Our Heirloom Picks
If you're ready to start growing with heirloom varieties, here are a few favourites from our range:
- Sunflower Seeds — Heirloom Non-GMO — a classic that never disappoints
- White Garlic Flower Seeds — unusual, beautiful, and a conversation starter
- Mixed Herb Seeds — a practical, flavourful starting point for any edible garden
Browse our full seed range for more non-GMO and heirloom varieties suited to South African growing conditions.
The Bottom Line
Heirloom seeds are more than a gardening choice — they're a commitment to biodiversity, flavour, and the kind of gardening that gives back. If you've never grown from heirloom seed before, this spring is the perfect time to start.