Dahlia

Choosing the right dahlia depends on the effect you want in your garden. Decorative dahlias offer large double flowers ideal for flower beds, while cactus dahlias bring unique texture with their tapered petals. For borders, choose dwarf varieties that don't exceed 40 cm.

Color plays an essential role: warm tones (red, orange, yellow) create dynamic focal points, while pastel shades (pink, white, lavender) add softness and elegance. Also consider the flowering period to stagger colors from July to the first frosts.

Planting and exposure

Dahlias thrive in sunny exposure with at least 6 hours of sunlight daily. Plant the tubers after the last frosts, 10-15 cm deep in well-drained soil enriched with compost. Spacing varies from 30 cm for dwarf varieties to 80 cm for large varieties.

Care and watering

Regular watering without excess is essential, especially during the growth period. Mulch around the base to maintain moisture and limit weeds. Stake tall varieties from planting to prevent stem breakage under the weight of flowers.

Tuber overwintering

In regions with harsh winters, dig up the tubers after the first frosts. Let them dry then store them in a cool, dry and well-ventilated place until the following spring. This step ensures beautiful blooms the next year.

Multiplication and varieties

Dividing tubers in spring allows you to easily multiply your favorite dahlias. Each section must have an eye to ensure successful regrowth. This technique preserves the characteristics of the parent plant.

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When to plant dahlias?

Plant dahlia tubers after the last frosts, generally from mid-April to May depending on your region. The soil should be warmed to above 10°C for successful planting.

Are dahlias frost-resistant?

Dahlias are sensitive to frost. In cold regions, dig up the tubers in autumn and store them protected from freezing. In Mediterranean zones, they can stay in the ground with protective mulch.

How to get abundant flowering?

To stimulate blooming, regularly remove faded flowers and apply fertilizer rich in phosphorus and potassium every 3 weeks during the growth period.

What exposure for dahlias?

Dahlias prefer sunny exposure with at least 6 hours of sunlight per day. Light partial shade is tolerated but may reduce flowering.

How to divide dahlia tubers?

Divide tubers in spring with a clean knife, ensuring each section has at least one eye. Let the cuts dry for a few hours before planting.

Do dahlias need staking?

Tall varieties require staking from planting to support the weight of flowers. Use sturdy stakes and gently tie stems with flexible ties.