The Botanical Diary
P
Flowers

Pompom Dahlia

Dahlia pinnata (pompom)
Also known aspompon dahlia, ball dahlia

Pompom dahlias have a spherical flower shape—a perfect geometric form.

Regions
all regions
Colour
yellow, pink, ліловий, red
Pompom Dahlia (pompon dahlia, ball dahlia)
🌸
Bloom
July–October
☀️
Light
Full sun
💧
Watering
Moderate
📏
Height
0,5–0,9 m
❄️
Hardiness
Zone 9 (зберігати)

Pompom dahlia is one of the most beloved forms of dahlia in gardening, originating from Mexico's mountain regions. This plant has been cultivated for over three centuries, but it acquired its characteristic ball-shaped flowers only in the twentieth century through selective breeding work. Today, countless varieties exist in colours ranging from pure white to deep burgundy and violet tones, making it a favourite of flower enthusiasts worldwide.

These compact beauties attract attention with their extraordinary geometric perfection: each flower is composed of small petals arranged precisely into a perfect sphere. It flowers tirelessly from July until the first frosts, providing the garden with constant colours throughout autumn. Unlike larger decorative and cactus dahlias, pompom forms have a more compact habit, making them ideal for gardens of any size—from small front gardens to spacious flowerbeds.

Pompom dahlias are reliable partners in complex garden compositions. They harmonise beautifully alongside gladiolus, canna, ornamental grasses, and dwarf marigolds. Pompom varieties produce long stems, perfect for cutting, so they are often grown specifically for floral arrangements. Care is minimal: moderate watering, light pinching for bushiness, and staking during flowering—and the plant will reward you with abundant blooms.

For many gardeners, pompom dahlias have become a symbol of late summer and early autumn—their appearance in the garden signals that the warmest, most colourful window of the year is near. They are incredibly beloved, with dewdrops breaking light on their petals, and simple to grow even for beginners.

Location & soil

Pompom Dahlia — planting & location

LightFull sun
Soil typerich, рН 6–7,5
Planting timeMay
Plant spacing0,4–0,5 m
Planting depth10–15 см

Compact form, ideal for borders

Water needs

How to water Pompom Dahlia

IntensityModerate
FrequencyEvery 7 days (в)
Volume10–15
MethodAt the base

Stake for support

Annual care

Fertilizing and pruning: Pompom Dahlia

Spring fertilizingNitrogen (June)
Summer fertilizingPhosphorus-potassium (August)
Autumn fertilizingDo not fertilise
Pruning timeПрищипка + осіння санітарна
Pruning typeПрищипка

Pinch back for bushiness at the level of the third pair of leaves

Cold hardiness

Pompom Dahlia — winter hardiness & care

Hardiness zoneZone 9 (зберігати)
Winter coverStore at 5–8°C in peat
Cover timingOctober
Plant protection

Diseases and pests of Pompom Dahlia

Diseases
Powdery mildew
Pests
Aphidтрипс
Garden design

What grows well with Pompom Dahlia?

Гладіолус, канна