There’s a reason the humble dahlia has an almost cult-like following among serious gardeners, and it isn’t just the flowers. It’s the story behind them.

A flower with a wilder history than you’d expect

Long before dahlias were a garden showpiece, they were a food crop. The Aztecs cultivated them centuries before Europeans ever laid eyes on one, not primarily for beauty, but because the tuberous roots were edible. When Spanish botanists first documented dahlias in Mexico in the late 1700s, their initial interest wasn’t ornamental at all. They were investigating dahlia tubers as a possible potato substitute for Europe.

That never quite caught on (the tubers store their carbohydrate as inulin rather than starch, giving them a very different texture to a potato), but the flower stuck around for an entirely different reason: nobody could stop breeding new varieties. The genus is named Dahlia after Anders Dahl, the Swedish botanist it was named in honour of, and today it’s Mexico’s official national flower, a title it’s held since 1963.

A fun, little-known fact that survives from those food-crop days: dahlia petals are genuinely edible. They’re mild and slightly peppery, and still used today as a garnish in salads.

Not one flower. Hundreds of shapes wearing the same name

Here’s what makes dahlias unusual among garden flowers: there isn’t really “a” dahlia. Breeders have registered more than 20,000 named cultivars, grouped into distinct “forms” that barely look related to each other. We’ve got four of those forms in stock right now, and each is worth knowing:

Cactus dahlias. Narrow, pointed, quill-like petals that curl and spike outward, giving the bloom a spiky, almost firework-like look. In stock: Ma Jolie, Einzi, Wagschal’s Krone, Belmonte, Good Earth, Colour Spectacle, Mev. Cl. Andries, and solid Yellow, Orange, Red and Pink.

Decorative dahlias. The classic, fuller form: broad, flat, layered petals in a dense, rounded bloom. This is the “textbook” dahlia most people picture. In stock: Edna Comstock, Nepos, Edinburgh, and solid Yellow and Pink.

Border dahlias. Bred to stay compact, making them the right choice for smaller beds, pots, or the front of a border rather than the back. Autumn Fairy and Park Princess are both in stock.

Dinner Plate dahlias. Exactly what the name promises. These produce blooms up to 25 to 30cm across, genuinely among the largest flowers you can grow in a home garden. Lavender Perfection and Otto’s Thrill are both available, and both are showstoppers on their own, no companion planting required.

Plus Dahlia Terrace Salsa, a striking addition to the range.

The growing guide, straight from the grower

This is real, supplier-provided growing information, not generic advice:

Family: Asteraceae (the daisy family)
Sun: Full sun. Will tolerate midday shade, which actually reduces water needs
Planting time: October to December
Flowering time: December to May
Planting depth: 8cm, tubers pointing down
Spacing: 15 to 40cm apart depending on variety
Watering: Every 3 to 4 days, about 10 minutes, once in the ground
Soil: Needs good drainage. If your soil is clay heavy, work in sand and compost. Mulching on top helps retain moisture
Mature height: Anywhere from 20cm to 180cm depending on variety, which is precisely why the range spans everything from compact Border types to towering Dinner Plate varieties
Feeding: Responds well to regular feeding with Hadeco Bulb Food
The bloom size trick: For bigger individual flowers, pinch off the two smaller side buds that grow next to a central bud, leaving it to develop alone. Simple, and it genuinely works
Staking: Taller varieties may need a stake once they start carrying the weight of full blooms
End of season: Dahlias go dormant May to August. Lift the tuberous roots in July. Cut the stem about 5cm above ground, lift carefully, and keep the roots dry while storing

Why this week specifically matters

Planting time for dahlias is October to December, and that window opens tomorrow. Get tubers into the ground early in that window and you’re looking at blooms from as early as December, right through to May. Wait until November or December to buy, and you’re simply shortening your own flowering season for no reason.

The full in-stock range

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Dahlias: The Story, Facts and Tips

A flower with a wilder history than you’d expect

Not one flower. Hundreds of shapes wearing the same name

The growing guide, straight from the grower

Why this week specifically matters

The full in-stock range

Cactus (R110 each unless noted)

Decorative (R110 each unless noted)

Border (2 tubers, R145 each)

Dinner Plate (R110 each)

Terrace (2 tubers, R145)

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