⭐ Advanced✂ Cut Flower🏆 Exhibition

Harvey Koop

Named for the man who once grew more dahlias than anyone on earth.

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Informal Decorative · 8–10"RedHarvey Koop (2010)United States

Harvey Koop was bred in United States by Harvey Koop in 2010. Harvey Koop is a sport of Spartacus, carrying the same deep wine-red base but streaked and speckled with coppery gold that reads like fire running through the petals. The genetics are unstable, so the same plant can throw variegated blooms one week and solid red the next. It also holds its form on the show bench.

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Availability & pricing

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Specifications

Physical

Form: Informal Decorative
Bloom class: A8–10"
Bloom size: 8–10"(20.3–25.4 cm)
Plant height: 48–60"

Color

Color: Red/Yellow
Pattern: Variegated
Tags: redwineburgundygoldyellowcopper

Growing context

Flowering season: Mid season
Cut flower: ✓ Yes
Exhibition: ✓ Yes
Stem length: 20"

Provenance

2010
United States
Breeder: Harvey Koop

Grower Profile

Difficulty

Advanced

Ideal for

FloristsExhibitors

Growing Harvey Koop

Stake your plant early and well. Harvey Koop inherits its parent's height and flower weight, and a thin stake will not hold it. Pinch the central stem at knee height to encourage multiple laterals and a heavier bloom count. Do not be surprised if some of your blooms come in solid red instead of variegated. The genetics swing from stem to stem on the same crown. Feed low-nitrogen once buds form to deepen color. Deadhead consistently to keep your plant producing through first frost.

Spacing: Space about 3 ft apart
Staking: Stake early — stems carry heavy blooms and lean in wind

Frequently asked questions

How tall does Harvey Koop dahlia grow?

Harvey Koop reaches 48–60" at maturity, so plan to stake plants early to keep heavy blooms upright.

When does Harvey Koop dahlia bloom?

Harvey Koop is a midseason bloomer, in flower from midsummer through first frost.

Is Harvey Koop dahlia good for cut flowers?

Yes — Harvey Koop is well suited for cutting, with approximately 4-day vase life. Stems typically reach about 20″.

Is Harvey Koop hard to grow?

Harvey Koop is rated challenging — it rewards experienced growers with patience and more attention to staking, feeding, and pest pressure than the average variety.