Garden Dahlias

Dahlia spp.

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The genus Dahlia contains many famous and rewarding summer bulbs that produce dazzling displays from summer to autumn. It contains around 38 species which have large tuberous root systems which produce bushy, herbaceous, bamboo-like stems. Around 20,000 cultivars are predominantly derived from D. pinnata and D. coccinea. Most Dahlias are divided into groups based on the form of their flower heads, from dwarf varieties to tall bushes and even tree specimens.
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Planning

Difficulty

Easy

Flowering time

Summer, Autumn

Harvesting

Harvest flowers during mid-summer months.

Propagation

Division

Divide of large clumps of bulbs and offsets in the dormant period (winter). Place offsets 20-30 cm apart and at a depth of 8 cm.

Special features

Attracts useful insects

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

Pot plant

Attractive flowers

Brings colour to the garden during autumn months. Flowers range from red, orange, yellow, violet, white, to pink.

Special features

Origin

Central America, Mexico to Columbia.

Natural climate

Temperate to warm

Environment

Light

Full Sun

Soil moisture

Moist

Soil type

Loam, Sand, Clay

Soil PH preference

Acid, Neutral, Alkaline

Frost hardiness

Tender

Personality

Family

Asteraceae

Flower colour

Multicoloured

Scent

Mild

Problems

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

Search our ever-growing knowledge base to find plants and information. Find out about pests and diseases you should be keeping an eye out for. Watch How to videos or follow step by step guides for tasks in the garden. Free download for your phone or tablet.
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