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Bulb
Asteraceae
Van Noort
Dahlia pinnata
‘Platinum Blonde’ Dahlia
From bulb to bloom
Common namePlatinum Blonde anemone dahlia
FamilyAsteraceae
GenusDahlia
Bulb typeBulb
Botanical nameDahlia
Quantity per pack1 tuber
‘Platinum Blonde’ Dahlia (Dahlia × hortensis) forms an upright branching clump approximately 75 cm tall and 50 cm wide according to Van Noort. Flowers about 9.5 cm across combine a ring of white outer florets with a dense tubular greenish-yellow central cushion. White undersides may carry fine light-purple stripes and speckles, a detail most visible as petals move. Divided dark green foliage supports bloom from July until the first frost. One No. 1 tuber suits sunny borders, large containers, and arrangements, while the tubular centre adds distinctive texture. The accepted cultivar and anemone classification are confirmed by the RHS register.
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 flowers. Maintain open airflow throughout humid summer weather and check moisture before watering again.
Place Platinum Blonde beside a path to examine the contrast between its white ring and greenish-yellow cushion. Pair it with blue salvias, pink gauras, purple verbenas, silver artemisias, or bronze grasses that emphasize luminosity without hiding the anemone form. Harvest stems early in the morning when flowerheads are fully open, then remove faded blooms regularly to renew buds. Its tubular centre may provide more access than fully double dahlias, but still 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.
Light and life cycle
In the garden
- Exposure
- Full sun
- Life cycle
- Perennial
- Hardiness
- Zone 10
Planting and establishment
Planting guide
Planting & establishment
Planting depth
10 to 12 cm (4 to 5 in.)
Planting period
May to early June in colder Canadian regions once the soil has warmed
Propagation
Division of tubers carrying at least one viable bud
Growing method
Plant horizontally after frost, water during establishment, pinch young shoots, stake when needed, and remove faded blooms to extend flowering. In containers, a generous volume of potting mix and ample drainage holes stabilize moisture. In cold Canadian climates, lift the tuber after the first frost, let it dry, and store it somewhere cool, dry, and frost-free. Check its firmness periodically through winter. Flamingo-pink flowers with apricot centres complement blue salvias, white cosmos, and airy grasses. The anemone form contributes distinctive texture to borders, containers, and bouquets. Harvesting stems regularly also stimulates new buds. Replant only healthy sections carrying a viable bud.
Soil and care
Soil and care
Soil & care
Soil pH
Slightly acidic to neutral
Minimum temperature
5 °C (41 °F)
Care level
Moderate
Watering
Water deeply and regularly; let the surface dry slightly between applications This selection needs a sunny, warm, sheltered position and fertile soil that releases excess water quickly.
Soil type
Fertile, humus-rich, loose, moist, very well-drained soil This selection needs a sunny, warm, sheltered position and fertile soil that releases excess water quickly.
Fertilization
Compost at planting, then a potassium-rich fertilizer during flowering This selection needs a sunny, warm, sheltered position and fertile soil that releases excess water quickly. Pinching young shoots encourages several.
Seasonal care
Pinch shoots when they reach 20 to 30 cm, stake stems exposed to wind, water during dry periods, and deadhead regularly. After the first frost, cut back, lift, dry, and store the tuber in a frost-free place. In containers, a generous volume of potting mix and ample drainage holes stabilize moisture. In cold Canadian climates, lift the tuber after the first frost, let it dry, and store it somewhere cool, dry, and frost-free. Check its firmness periodically through winter. Flamingo-pink flowers with apricot centres complement blue salvias, white cosmos, and airy grasses. The anemone form contributes distinctive texture to borders, containers, and bouquets. Harvesting stems regularly also stimulates new buds. Replant only healthy sections carrying a viable bud.
Growing in containers
Container growing
Container growing
Recommended pot size
Container at least 40 cm (16 in.) wide and deep
Choose a stable container at least 40 cm wide with several drainage holes. Use rich potting mix, water regularly, and feed without excess nitrogen. In containers, a generous volume of potting mix and ample drainage holes stabilize moisture. In cold Canadian climates, lift the tuber after the first frost, let it dry, and store it somewhere cool, dry, and frost-free. Check its firmness periodically through winter. Flamingo-pink flowers with apricot centres complement blue salvias, white cosmos, and airy grasses. The anemone form contributes distinctive texture to borders, containers, and bouquets. Harvesting stems regularly also stimulates new buds. Replant only healthy sections carrying a viable bud.
Growth and flowering
Size, flowering & harvest
Mature height
60 to 80 cm (24 to 32 in.)
Width / spread
40 to 50 cm (16 to 20 in.)
Flower color
White with greenish-yellow centre; fine light-purple markings may occur underneath
Foliage color
Dark green
Foliage type
Deciduous
Growth rate
Fast
Bloom period
Abundant repeat flowering from summer until the first frost This selection needs a sunny, warm, sheltered position and fertile soil that releases excess water quickly. Pinching young shoots encourages several.
Harvest
July to October. Cut fully open flowers for the best vase life.
Garden companions
Garden associations
Companion plants & uses
Companion plants
Blue salvia, white cosmos, purple verbena, and fine ornamental grasses This selection needs a sunny, warm, sheltered position and fertile soil that releases excess water quickly.
Garden use
Plant in groups in a sunny border, through the middle of a flower bed, or in a large patio pot. Its pink and apricot tones complement blue, white, and purple flowers. In containers, a generous volume of potting mix and ample drainage holes stabilize moisture. In cold Canadian climates, lift the tuber after the first frost, let it dry, and store it somewhere cool, dry, and frost-free. Check its firmness periodically through winter. Flamingo-pink flowers with apricot centres complement blue salvias, white cosmos, and airy grasses. The anemone form contributes distinctive texture to borders, containers, and bouquets. Harvesting stems regularly also stimulates new buds. Replant only healthy sections carrying a viable bud.
Frequently asked questions
Frequently asked questions
When should ‘Platinum Blonde’ dahlia be planted in colder Canadian regions?
Plant after the last frost once the soil has warmed, generally from May to early June. Wait longer if the ground remains cold or saturated.
What is Platinum Blonde’s exact flower form?
Platinum Blonde belongs to the anemone-flowered dahlia group. Each approximately 9.5 cm flowerhead has a ring of relatively flat white outer florets surrounding a dense central group of tubular greenish-yellow florets. The RHS register also notes that white undersides may carry light-purple stripes and speckles. It is therefore neither a single flower nor a fully double Ball flowerhead. This particular structure explains its texture and usefulness in arrangements. Keep the complete name with the tuber so the cultivar is not confused with other plants also called Platinum Blonde or with white dahlias from another class. Check the label again before spring planting and storage.
How can flowering be extended?
Provide at least six hours of sun, even moisture, potassium-rich feeding, and remove spent flowerheads before seeds develop. In containers, a generous volume of potting mix and ample drainage holes stabilize moisture.
Is Platinum Blonde suitable for container growing?
Yes. Use a stable container at least 40 cm wide, fertile free-draining mix, and monitor watering more often during hot weather.
How should the tuber be stored over winter?
After the first frost, lift it, let the surface dry, and place it somewhere dark, cool, dry, and frost-free. Inspect it monthly.
Wildlife and pets
Wildlife & precautions
Supporting wildlife
Single flowers with open discs make pollen and nectar accessible to bees, hoverflies, and butterflies during summer flowering. Extend the border’s value by pairing this dahlia with sweet alyssum, salvias, and verbenas blooming before or after it. Avoid insecticides on flowers and provide a shallow dish of clean water nearby.
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