A picture of a Dahlia

Dahlia

Dahlia spp.

FIDALGOBLACKY by en.wikipedia (CC-BY-SA-3.0)

Full Sun
Moderate care
Light watering
Tender

9a-11b

USDA zone

-7°C

Minimum temperature

Expected size

Height
Spread

1.8m

Max

80cm

20cm

Min

20cm

2 years to reach maturity

Flowering

    • spring
    • summer
    • autumn
    • winter

    This plant has no fragrance

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    A photo of Dahlia
    A photo of Dahlia
    A photo of Dahlia
    A photo of Dahlia

    Dahlia Overview

    Dahlias are tuberous herbaceous perennials with usually dark green, toothed, pinnately divided leaves. The showy flowers - often double - are produced in summer and autumn. They are very popular with gardeners, as cut flowers and as show exhibits. Dahlias come in many colours and from tall to dwarf varieties. All need to be planted in a sheltered, sunny position in humus-rich, well-drained soil. They can be treated as perennials or annuals. Originating from the mountainous regions of Mexico and Central America, the Dahlia genus contains around 30 species and over 20,000 cultivars, most of which are derived from D. pinnata and D. coccinea, and divided into groups based on the form of their flower heads. These striking plants will add interest to almost all garden styles and many Dahlia cultivars have earned a coveted 'RHS Award of Garden Merit'. They are also nectar-rich and excellent for attracting bees and other pollinators to your garden - especially the single-flowered varieties, from which it is easier for them to feed.

    Common problems with Dahlia

    Dahlia have a tendency to be affected by fungal diseases such as powdery mildew or grey mould if planted in poorly draining soil.

    How to harvest Dahlia

    Flowers can be cut as required for floral arrangements. Best picked in the early morning when the flower contains the most moisture content; use a sharp pair of scissors and take as long a stem as possible.

    How to propagate Dahlia

    Tubers

    Cuttings

    In spring take soft-wood cuttings from the shoots appearing from stored tubers.

    Division

    Lifted clumps of Dahlias can be divided in late winter, ensuring each section has an 'eye' (growing tip).

    Seed

    Seed from cultivars can be harvested and sown, but flowers are unlikely to come 'true'.

    Special features of Dahlia

    Attracts useful insects

    It attracts beneficial pollinators such as butterflies, bees and moths.

    Pot plant

    Can be grown in large containers.

    Attractive flowers

    Autumn colour

    Other uses of Dahlia

    Grown as bedding plants or for their flower heads, which are good for cutting or exhibition. Suitable for coastal conditions.

    Exotic Plants

    Add these plants to your space to give an exotic feel.

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