Dahlia Collarette 'Bumble Rumble'

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Dahlia Collarette ‘Bumble Rumble’ is a striking and playful collarette dahlia known for its bold contrast, lively color patterning, and distinctive petal arrangement. Each bloom features a single row of broad, velvety outer petals that blend rich golden yellow with deep crimson streaks or splashes, creating a fiery, painterly effect. These outer petals surround the flower’s hallmark feature: a delicate “collar” of smaller, lighter petals that sit just above the center like a ruffled halo. The collar is typically cream to pale yellow, offering a soft counterpoint to the dramatic outer ring.

Planting Tips for Dahlia Collarette ‘Bumble Rumble’

Site Selection

• Choose a sunny location that receives 6 to 8 hours of direct sunlight daily.

• Good airflow is helpful to keep foliage dry and reduce disease risk.

Soil Preparation

• Use well-draining soil enriched with compost or aged manure.

• Aim for a soil pH between 6.2 and 7.0.

• Avoid heavy, soggy soil, which can rot tubers.

Planting Depth and Spacing

• Plant once frost danger has passed and soil temperature reaches about 60°F.

• Dig a hole 4 to 6 inches deep.

• Lay the tuber horizontally with its eye facing upward.

• Cover lightly and water sparingly until shoots emerge.

• Space plants 18 to 24 inches apart to allow airflow and room for branching.

Support

• Although collarette dahlias are usually lighter than larger types, ‘Bumble Rumble’ still benefits from a small stake or cage, especially in windy areas.

Watering

• After planting, hold off on heavy watering until stems appear.

• Once growing, water deeply 2 to 3 times per week depending on heat and soil type.

• Keep moisture consistent but never waterlogged.

Fertilizing

• Use a low-nitrogen fertilizer such as 5-10-10 or 10-20-20.

• Begin feeding after plants reach about 12 inches and repeat every 3 to 4 weeks.

Care and Maintenance

• Pinch the growing tip when the plant reaches about 12–16 inches to encourage branching and more blooms.

• Deadhead regularly to extend the flowering season.

• Keep mulch around the base to conserve moisture and reduce weeds, but leave space around the stem to prevent rot.

End-of-Season Care

• In cold climates, dig up tubers after the first frost, label them, and store in a cool, dry place.

• In mild climates, tubers may overwinter in the ground with a layer of mulch for protection.