A cheerful and compact variety, Dahlia ‘Happy Days Bicolour’ produces a mass of single flowers in vivid pink with bright white tips, creating a two-tone effect that stands out beautifully against its deep, almost black foliage. Flowering over a long period from midsummer to autumn, this dahlia is ideal for pots, raised beds, or the front of sunny borders. Its compact size and vibrant colours make it a firm favourite for pollinators and gardeners alike.

Dahlia ‘Happy Days Bicolour’, commonly known as Bicolour Happy Days Dahlia, is part of the ‘Happy Days’ series – bred for compact growth, showy blooms, and richly coloured foliage.

Tender Perennial

Compact, Flowering, Summer–Autumn Interest

Flowers: July–October Foliage: Spring–Autumn

Scientific Name
Dahlia ‘Happy Days Bicolour’ (genus named after Swedish botanist Anders Dahl)

Synonyms
None widely used

Common Name
Bicolour Dahlia, Happy Days Dahlia

Origin
Cultivated hybrid; parent species native to Mexico and Central America

Pruning Tips
Deadhead regularly to keep flowers coming. Cut back after the first frost, or lift and store tubers for winter.

Wildlife Value
Single, open blooms are excellent for bees, butterflies, and other pollinators.

Positioning
Full sun preferred. Great for containers, borders, and pollinator-friendly garden designs.

Water
Keep soil consistently moist during the growing season. Water at the base to prevent fungal issues on leaves.

Soil
Well-drained, fertile soil is best. Enrich planting areas with compost or organic matter to boost growth.

Food
Feed every 1–2 weeks from midsummer with a high-potash fertiliser to support flowering.

Pet-safe
Toxic if ingested – keep out of reach of pets and children.

Sprouts Top Tips
Perfect for colourful patio pots – combine with trailing lobelia or bright marigolds for a dazzling summer display. Lift tubers in autumn and store somewhere dry and frost-free, or grow in containers that can be brought indoors.