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Dormant tuber
Asteraceae
White Ball dahlia for gardens and arrangements
‘Petra’s Wedding’ Ball Dahlia
Dahlia ‘Petra’s Wedding’
Product code : VAN-327-423-15
Petra’s Wedding forms an upright clump approximately 75 cm tall and 50 cm wide, carrying white, fully double, nearly spherical Ball flowers. Regularly inrolled florets create clean geometry above green foliage. Plant the No1 tuber 10 cm deep in full sun and fertile, humus-rich, moist, well-drained soil. Install support early, water deeply at soil level, and remove faded flowerheads to sustain bloom from midsummer until frost. In Canada, lift the tuber after the first frost and overwinter it somewhere cool, dry, dark, and frost-free. Keep the complete cultivar label with stored material until spring planting. Inspect stored tubers carefully each month.
- Quantity
- 1 No1 tuber
- Exposure
- Full sun
- Life cycle
- Annual under Quebec conditions
- Hardiness
- Zone 8; lift the tuber in colder regions
Discover the plant
Common namePetra’s Wedding Ball dahlia
FamilyAsteraceae
GenusDahlia
SpeciesGarden hybrid of Ball type
CultivarPetra’s Wedding
TypeDormant tuber
Botanical nameDahlia ‘Petra’s Wedding’
Reproducible seedsYes
‘Petra’s Wedding’ Ball dahlia (Dahlia ‘Petra’s Wedding’) forms an upright branching clump approximately 75 cm tall and 50 cm wide. White, fully double, nearly spherical Ball flowers assemble regularly inrolled florets around a closed centre. Their clean luminous geometry stands clearly above divided green foliage. From midsummer until the first frost, one Van Noort No1 tuber carries sturdy stems suited to borders, large containers, and ceremonial arrangements. The RHS recognizes Petra’s Wedding as an accepted Dahlia cultivar, while Van Noort confirms its Ball class, white colour, and upright habit. Its moderate height makes the flowers accessible for regular cutting without sacrificing presence in a mixed border.
Plant the tuber in spring after the final frost when soil has warmed and drained. Lay it 10 cm deep with its bud facing upward in fertile, humus-rich soil that remains moist yet drains freely. Leave 50 cm around the crown and install discreet support at planting. Water sparingly before emergence, then deeply at soil level whenever the surface begins to dry. Pinch the young shoot between 20 and 30 cm to encourage several branches. Incorporate mature compost and apply moderate fertilizer richer in potassium while buds develop. Avoid standing water, excessive nitrogen, and repeated irrigation over white flowerheads. Maintain open airflow throughout humid weather and check moisture before watering again.
Place Petra’s Wedding beside a path or at the centre of a pale composition where white flowers structure the display. Pair it with blue salvias, pink gauras, purple verbenas, silver artemisias, or bronze grasses that emphasize luminosity without dulling it. Harvest stems early in the morning when flowerheads are nearly open, then remove faded blooms regularly to renew buds. Highly double flowers provide little accessible pollen, so include nearby simple flowers for pollinators. Watch for slugs, aphids, earwigs, and spider mites while maintaining generous airflow. In cold Canadian climates, lift the tuber after the first frost, dry its surface, label it, and store it somewhere cool, dry, dark, and frost-free until spring. Inspect stored material monthly.
Sowing guide
It all startswith a seed.
Sowing depth
10 cm (4 in)
Spacing / density
50 cm (20 in) between plants
Sowing period
May to early June once soil is warm
Propagation
Division of a tuber carrying a viable bud
Growing method
After the final frost, loosen sunny soil to 30 cm and incorporate mature compost. Lay the tuber horizontally 10 cm deep with its bud upward, keeping 50 cm around the clump. Close without compacting and water sparingly before emergence to prevent rot. When shoots reach 20 to 30 cm, pinch above a leaf pair to encourage branching. Install a discreet stake or ring immediately. Water deeply at the base whenever the surface dries and apply fertilizer moderate in nitrogen and richer in potassium from bud formation. Tie stems with soft material. Remove faded flowers until frost. Once foliage blackens, cut, lift, dry, and store the tuber away from frost. Petra’s Wedding is a rounded Ball dahlia with large double pure white flowers. Regularly inrolled petals create full, balanced flowerheads with refined texture. The upright clump reaches about 75 cm and benefits from discreet staking in windy places. Full sun and fertile humus-rich fresh drained soil support sturdy stems. Feeding moderate in nitrogen and richer in potassium accompanies bud formation. Pinching branches young shoots and removing faded flowerheads extends flowering. In Quebec, the tuber must be lifted after frost and stored somewhere cool and frost-free.
Soil and care
The right care,at the right time.
Soil pH
Slightly acidic to neutral
Minimum temperature
5 °C (41 °F)
Care level
Moderate
Watering
Before emergence, water only when soil becomes distinctly dry. Once stems establish, apply water deeply at the base whenever the surface begins drying, especially during bud development and heat. Let drainage work between applications. Avoid wetting double flowers and foliage in the evening because prolonged moisture favours spotting and grey mould. Petra’s Wedding is a rounded Ball dahlia with large double pure white flowers.
Soil type
Prepare fertile, humus-rich, loose, freely drained loam retaining even freshness during growth. Mature compost improves structure and supplies gentle reserves. On heavy soil, raise the planting slightly and incorporate coarse mineral material. Avoid hollows where water stands around the tuber, constantly wet substrates, and very dry ground that weakens stems and buds. Petra’s Wedding is a rounded Ball dahlia with large double pure white flowers.
Fertilization
Incorporate mature compost before planting. From active growth, use balanced fertilizer low to moderate in nitrogen, then favour a potassium-richer formula as buds form. Follow labelled rates and water afterward. Excess nitrogen produces soft stems, abundant leaves, and fewer flowers. Stop feeding several weeks before autumn lifting. Petra’s Wedding is a rounded Ball dahlia with large double pure white flowers. Regularly inrolled petals create full, balanced flowerheads with refined texture.
Moisture
Maintain even soil moisture without saturation during active growth. Large double flowers become heavy after rain; good air circulation, 50 cm spacing, and support reduce breakage and slow drying. Never let thick mulch touch the crown. During storage, keep a cool dry atmosphere that prevents both extreme shrivelling and rot. Petra’s Wedding is a rounded Ball dahlia with large double pure white flowers.
Seasonal care
In spring, inspect the tuber, prepare soil, plant after frost, and install support before stems become fragile. Pinch young shoots to branch the clump. In summer, water deeply, tie with soft material, feed moderately, and remove faded flowers regularly. Harvest stems early in the morning using clean tools. Monitor slugs, aphids, earwigs, spider mites, and mould without needlessly treating neighbouring flowers. In autumn, wait until frost blackens foliage, cut stems to 10 or 15 cm, lift the tuber without injury, and let its surface dry. Label Petra’s Wedding clearly. In winter, store it somewhere cool, dry, dark, and frost-free. Inspect monthly, remove soft tissue, and prevent both condensation and complete desiccation. Petra’s Wedding is a rounded Ball dahlia with large double pure white flowers. Regularly inrolled petals create full, balanced flowerheads with refined texture. The upright clump reaches about 75 cm and benefits from discreet staking in windy places. Full sun and fertile humus-rich fresh drained soil support sturdy stems. Feeding moderate in nitrogen and richer in potassium accompanies bud formation. Pinching branches young shoots and removing faded flowerheads extends flowering. In Quebec, the tuber must be lifted after frost and stored somewhere cool and frost-free. Double flowers suit arrangements and borders but provide little food for pollinators. Water deeply at the base when the surface dries without saturating the crown.
Container growing
A garden,within reach.
Recommended pot size
At least 45 cm wide and deep
Use a stable container at least 45 cm wide and deep with numerous holes. Fill it with rich potting mix amended with compost and drainage material. Set one tuber 10 cm below the surface and immediately install a central stake or discreet cage. Keep the pot in full sun protected from strong wind. Water deeply whenever the upper centimetres dry and always empty the saucer. Feed moderately during growth, then emphasize potassium from bud formation. Pinch young shoots and remove faded flowers. Rotate the container regularly for balanced growth. After the first frost, cut stems, let the mix dry slightly, and remove the tuber for cool dry frost-free storage until spring. Petra’s Wedding is a rounded Ball dahlia with large double pure white flowers. Regularly inrolled petals create full, balanced flowerheads with refined texture. The upright clump reaches about 75 cm and benefits from discreet staking in windy places. Full sun and fertile humus-rich fresh drained soil support sturdy stems. Feeding moderate in nitrogen and richer in potassium accompanies bud formation. Pinching branches young shoots and removing faded flowerheads extends flowering. In Quebec, the tuber must be lifted after frost and stored somewhere cool and frost-free.
Bloom and dimensions
Its place,in your garden.
Mature height
75 cm (30 in)
Width / spread
50 cm (20 in)
Flower color
Pure white
Foliage color
Green
Foliage type
Deciduous after frost
Growth rate
Fast
Growth habit
Tall upright clump
Bloom period
Fully double Petra’s Wedding flowers are very large and repeat from midsummer until the first frost. Broad pure white petals form full, balanced, luminous Ball blooms. Cut faded flowerheads above a leaf pair to renew buds. Support and good airflow protect this delicate texture after rainfall. Petra’s Wedding is a rounded Ball dahlia with large double pure white flowers. This attention preserves vigour and the quality of its large pure white flowers.
Harvest
July to October. Pick the flowers when fully open for best vase life.
Garden associations
In goodcompany.
Companion plants
Pair Petra’s Wedding with blue salvias, purple verbenas, white gauras, chocolate cosmos, sweet alyssum, and bronze grasses sharing sun and drained soil. Airy silhouettes and simple flowers highlight rounded Ball flowerheads while providing insects with more accessible resources. Keep 50 cm around the tuber and avoid highly aggressive roots or plants requiring constantly dry ground. Petra’s Wedding is a rounded Ball dahlia with large double pure white flowers. Regularly inrolled petals create full, balanced flowerheads with refined texture. This attention preserves vigour and the quality of its large pure white flowers.
Frequently asked questions
Your questions,answered.
When should Petra’s Wedding dahlia be planted?
Plant Petra’s Wedding in spring after the final frost when soil has warmed and no longer remains saturated. Lay the tuber horizontally 10 cm deep with its bud upward, leaving approximately 50 cm around the crown. In cold regions, starting it indoors in a pot four to six weeks earlier advances growth, but acclimate the plant gradually before moving it outside. Water very sparingly before emergence to prevent rot, then increase moisture as shoots and roots become active. Install discreet support at planting when the position receives strong winds through summer. Check the soil surface before every additional watering outdoors.
Is Petra’s Wedding a recognized cultivar?
Yes. The RHS lists Dahlia Petra’s Wedding with accepted name status, while Van Noort classifies it as a white-flowered Ball dahlia. This guide therefore uses the cultivar in the title without inventing a species name. That identification matches the purchased No1 tuber: upright habit, approximately 75 cm height, 50 cm spread, summer flowering, and full-sun culture. Keep the complete label with the tuber throughout cultivation and storage. This precaution distinguishes the selection from other white dahlias and helps its regular Ball form return faithfully when it is replanted the following spring. Maintain the label until active growth confirms the stored crown.
Is Petra’s Wedding suitable for arrangements?
Yes. Its firm spherical fully double flowers add geometric structure to arrangements, and every regular white finish becomes a distinctive detail. Cut stems early in the morning when flowerheads are nearly open because dahlias develop little after harvest. Use a clean tool, remove leaves that would sit in water, and immediately place stems in a cool bucket. Refresh vase water and recut ends regularly. Frequent harvesting combined with removing faded flowerheads prevents seed formation and encourages the plant to produce fresh buds until the first frost, extending material available for colourful seasonal displays in the home and garden all summer long.
Can Petra’s Wedding grow in a container?
Yes. Its approximately 75 cm height suits a stable container at least 40 cm wide and deep with large drainage holes. Fill it with fertile airy mix, plant the tuber 10 cm deep, and install discreet support. Keep the pot in full sun, water deeply when the upper few centimetres dry, and always empty its saucer. Feed moderately with additional potassium once buds appear, pinch the shoot, and remove faded flowers. Rotate the container for balanced growth. Before frost, lift the tuber and store it somewhere cool, dry, dark, and frost-free until the following spring. Inspect drainage after every heavy rain.
How should Petra’s Wedding be overwintered in Canada?
After the first frost blackens foliage, cut stems to 10 or 15 cm. Lift widely around the crown with a fork to avoid injuring tuberous roots, gently remove loose soil, and let the surface dry in a sheltered place. Store the labelled tuber in lightly insulating material somewhere cool, dry, dark, and frost-free. Inspect it monthly, remove any soft section with a clean tool, and increase ventilation if condensation appears. Replant only after frost risk has passed and the soil has warmed enough for active growth. Keep each cultivar clearly labelled throughout storage and discard severely rotted material promptly outdoors.
Wildlife and pets
Life,around your plants.
Supporting wildlife
Fully double Petra’s Wedding flowers hide nearly all of their disc and therefore offer little accessible pollen or nectar. Their value is mainly ornamental. Support wildlife by pairing this dahlia with salvias, sweet alyssum, verbenas, and other simple flowers, avoiding insecticides, providing shallow clean water, and maintaining several flowering periods in the border. Petra’s Wedding is a rounded Ball dahlia with large double pure white flowers.
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