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Black Jack

The stem everyone at the farmers market asks about.

1 grower selling· from $17Jump to sellers
Black Jack dahlia — community photo
★ First community photo

Photo by Admin

Semi-Cactus · 6–8"RedNetherlands

Black Jack is a semi-cactus dahlia that opens 6–8" blooms in red. Set one stem on a table and it becomes the center of gravity in the room. Black Jack earns that reaction through its near-black petals — long, pointed, curled at the edges — that absorb light instead of reflecting it, making every other color around it pop. It also holds its form on the show bench.

1 grower listing · from $17

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Availability & pricing

Only one grower is currently listing Black Jack, which makes this a limited-availability dahlia this season. Listings are priced at $17 — above the typical range for semi-cactus dahlias this season.

Sellers ship from NJ. Most current listings are pre-order, which is typical for tubers outside the spring shipping window.

Specifications

Physical

Form
Semi-Cactus
Bloom class
B6–8"
Bloom size
6–8"(15.2–20.3 cm)
Plant height
39–55"

Color

Color
Red
Pattern
Solid
Tags
dark rednear blackburgundydeep redalmost blackvelvety

Growing context

Flowering season
Mid season
Cut flower
✓ Yes
Exhibition
✓ Yes

Provenance

Netherlands
Country of origin

Growing Black Jack

Plant your tuber in full sun after the last frost date. Pinch the center shoot when your plant has several sets of leaves to push out more branching stems and a bigger harvest. Stake early, your plant will get tall and the flower heads are heavy enough to snap stems in wind. Water consistently and feed with a low-nitrogen fertilizer once buds appear. The dark color intensifies as temperatures cool in late summer, so later plantings can actually reward you with the best blooms of the season.

Spacing
Space roughly 2–3 ft apart
Staking
Stake early — stems carry heavy blooms and lean in wind

Frequently asked questions

Where can I buy Black Jack dahlia tubers?

Black Jack is currently listed by 1 grower on The Dahlia Hub, with prices starting at $17. Compare sellers in the listings panel above to check availability, shipping, and ratings.

How much are Black Jack dahlia tubers?

Tubers of Black Jack on The Dahlia Hub are listed at $17.

How tall does Black Jack dahlia grow?

Black Jack reaches 39–55" at maturity, so plan to stake plants early to keep heavy blooms upright.

When does Black Jack dahlia bloom?

Black Jack is a midseason bloomer, in flower from midsummer through first frost.

Is Black Jack dahlia good for cut flowers?

Yes — Black Jack is well suited for cutting.

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