🌱 Beginner Friendly✂ Cut Flower

Worton Blue Streak

Lilac petals that cool to blue-violet on overcast days.

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Semi-Cactus · 4–6"PurpleLewis (1975)United Kingdom

Worton Blue Streak was bred in United Kingdom by Lewis in 1975. Lilac-purple petals curl at the tips and take on a cooler blue-violet cast in overcast light, warming to pink-lilac under full sun. A British-bred cultivar from the Lewis family at Worton, registered with RHS in 1975, it holds a loyal following among UK growers for moody tone shifts. Worton Blue Streak is a semi-cactus dahlia that opens 4–6" blooms in purple.

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Specifications

Physical

Form
Semi-Cactus
Bloom class
BB4–6"
Bloom size
4–6"(10.2–15.2 cm)
Plant height
35–47"

Color

Color
Purple
Pattern
Solid
Tags
lilaclavendervioletmauvecool-tone

Growing context

Flowering season
Mid season
Cut flower
✓ Yes
Stem length
18"

Provenance

1975
United Kingdom
Breeder
Lewis

Grower Profile

Difficulty

Beginner friendly

Ideal for

BeginnersFlorists

Growing Worton Blue Streak

Pinch at four true leaves to build branching, then stake early because stems run long and can flop once heads fill out. Harvest when outer petals have unfurled but the center is tight for best hold after cutting.

Spacing
Space roughly 2–3 ft apart
Staking
Staking recommended once buds set

Frequently asked questions

How tall does Worton Blue Streak dahlia grow?

Worton Blue Streak reaches 35–47" at maturity, so plan to stake plants early to keep heavy blooms upright.

When does Worton Blue Streak dahlia bloom?

Worton Blue Streak is a midseason bloomer, in flower from midsummer through first frost.

Is Worton Blue Streak dahlia good for cut flowers?

Yes — Worton Blue Streak is well suited for cutting. Stems typically reach about 18″.

Is Worton Blue Streak a good dahlia for beginners?

Worton Blue Streak is rated beginner-friendly — reliable in typical garden conditions without specialized care.

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