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Dormant tuber
Asteraceae
Giant white and purple bicolour dahlia
Giant ‘Ferncliff Illusion’ Dahlia (Dahlia ‘Ferncliff Illusion’)
Product code : VAN-327-411-30
Ferncliff Illusion produces large creamy white double flowers whose lavender-purple tips create refined contrast. Its No1 tuber forms an upright clump approximately 125 cm tall and 50 cm wide, ideal for the back of a border or cutting garden. Plant it 10 cm deep in full sun and fertile, humus-rich, fresh drained soil. Early staking, deep watering at the base, and removal of faded flowers sustain blooming from midsummer until frost. In Canada, lift the tuber after the first frost and store it somewhere cool, dry, and frost-free through winter. Regular cutting encourages more bicoloured blooms and keeps the tall supported clump productive through the late summer season.
- 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 nameGiant Ferncliff Illusion dahlia
FamilyAsteraceae
GenusDahlia
SpeciesGarden hybrid of Dinnerplate type
CultivarFerncliff Illusion
TypeDormant tuber
Botanical nameDahlia
Reproducible seedsYes
Giant ‘Ferncliff Illusion’ Dahlia (Dahlia ‘Ferncliff Illusion’) ‘Ferncliff Illusion’ is a spectacular Dinnerplate dahlia whose large double flowers combine creamy white bases with lavender-purple tips. Broad petals curve gently and create formal blooms reaching approximately 15 cm according to the RHS register description. Each No1 tuber forms an upright clump approximately 125 cm tall and 50 cm wide with dense green foliage. From midsummer until the first frost, this Van Noort selection renews its bicoloured flowers on long stems. It brings light, contrast, and sophistication to sunny borders and cutting gardens, where every bloom provides a refined focal point in fresh arrangements.
Plant the tuber in spring after the final frost when soil has warmed. Lay it horizontally 10 cm deep with its bud facing upward in fertile, humus-rich soil that stays fresh yet drains perfectly. Choose full sun and leave 50 cm around the crown. Because the clump reaches 125 cm and carries heavy double blooms, install sturdy support at planting. Water sparingly before emergence, then deeply at the base whenever the surface dries. Pinch the shoot at 20 or 30 cm, incorporate compost, and apply fertilizer richer in potassium with moderation from bud formation. Keep foliage dry while watering and maintain open airflow.
Place ‘Ferncliff Illusion’ at the back of a border or beside a path in the cutting garden. White petals tipped lavender-purple combine beautifully with blue salvias, purple verbenas, white gauras, silver artemisias, and bronze grasses. Harvest nearly open stems early in the morning and remove faded flowerheads to extend production. Highly double blooms are mainly ornamental, so add simple open flowers nearby for pollinators. In Canada, after the first frost, cut stems, gently lift the crown, let its surface dry, and keep the labelled tuber somewhere cool, dry, dark, and frost-free until the following spring.
Planting guide
Plant well.Grow beautifully.
Planting depth
10 cm (4 in)
Spacing / density
50 cm (20 in) between plants
Best planting time
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. Ferncliff Illusion is a giant Dinnerplate dahlia with large double creamy white with lavender-purple tips flowers. Broad gently curved petals create full, balanced flowerheads with refined texture. The upright clump reaches about one metre 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. Ferncliff Illusion is a giant Dinnerplate dahlia with large double creamy white with lavender-purple tips 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. Ferncliff Illusion is a giant Dinnerplate dahlia with large double creamy white with lavender-purple tips 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. Ferncliff Illusion is a giant Dinnerplate dahlia with large double creamy white with lavender-purple tips flowers. Broad gently curved 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. Ferncliff Illusion is a giant Dinnerplate dahlia with large double creamy white with lavender-purple tips 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 25 cm, lift the tuber without injury, and let its surface dry. Label Ferncliff Illusion clearly. In winter, store it somewhere cool, dry, dark, and frost-free. Inspect monthly, remove soft tissue, and prevent both condensation and complete desiccation. Ferncliff Illusion is a giant Dinnerplate dahlia with large double creamy white with lavender-purple tips flowers. Broad gently curved petals create full, balanced flowerheads with refined texture. The upright clump reaches about one metre 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. Ferncliff Illusion is a giant Dinnerplate dahlia with large double creamy white with lavender-purple tips flowers. Broad gently curved petals create full, balanced flowerheads with refined texture. The upright clump reaches about one metre 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
125 cm (50 in)
Width / spread
50 cm (20 in)
Flower color
Creamy white with lavender-purple tips
Foliage color
Green
Foliage type
Deciduous after frost
Growth rate
Fast
Growth habit
Tall upright clump
Bloom period
Fully double Ferncliff Illusion flowers are very large and repeat from midsummer until the first frost. Broad creamy white and lavender-purple petals form full, balanced, luminous Dinnerplate blooms. Cut faded flowerheads above a leaf pair to renew buds. Support and good airflow protect this delicate texture after rainfall. Ferncliff Illusion is a giant Dinnerplate dahlia with large double creamy white with lavender-purple tips flowers. This attention preserves vigour and the quality of its large creamy white and lavender-purple flowers.
Harvest
July to October. Pick the flowers when they are fully open to ensure the best vase life.
Garden associations
In goodcompany.
Companion plants
Pair Ferncliff Illusion 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 giant Dinnerplate 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. Ferncliff Illusion is a giant Dinnerplate dahlia with large double creamy white with lavender-purple tips flowers. Broad gently curved petals create full, balanced flowerheads with refined texture. This attention preserves vigour and the quality of its large creamy white and lavender-purple flowers.
Frequently asked questions
Your questions,answered.
When should Ferncliff Illusion be planted?
Plant Ferncliff Illusion in spring after the final frost when soil has warmed and no longer stays saturated. Lay the tuber horizontally 10 cm deep with its bud upward, keeping 50 cm clear 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. Immediately install the support needed by the future 125 cm clump. This careful practice supports consistent flowering and strong healthy stems throughout summer.
Why are the flowers bicoloured?
The colouring belongs to the Ferncliff Illusion cultivar. Every broad petal has a creamy white base and a lavender-purple zone concentrated toward its tip, drawing a variable edge around the double bloom. The proportion of purple may vary slightly among flowers with light, temperature, and opening stage without changing cultivar identity. Keep the plant in full sun for strong stems and generous flowering. In arrangements, combine these blooms with white, blue, purple, and silver foliage to emphasize their delicate transition. This careful practice supports consistent flowering and strong healthy stems throughout summer. This careful practice supports consistent flowering and strong healthy stems throughout summer.
Does this variety need staking?
Yes. Ferncliff Illusion reaches approximately 125 cm and its large double flowers become heavy after rain or in wind. Place a stake, ring, or cage beside the tuber at planting so the crown is not pierced later. Use broad soft ties, check them through growth, and loosen them when needed. Pinching the shoot at 20 or 30 cm encourages a more branched clump but does not completely replace support in an exposed position. Good airflow also helps flowerheads dry quickly. This careful practice supports consistent flowering and strong healthy stems throughout summer. This careful practice supports consistent flowering and strong healthy stems throughout summer.
Can it be grown in a container?
Yes, but choose a stable container at least 45 cm wide and deep with large drainage holes. Fill it with fertile airy mix, plant the tuber 10 cm deep, and install sturdy support. Keep the pot in full sun, water deeply when the upper few centimetres dry, and always empty its saucer. Feed moderately, pinch the shoot, and remove faded flowers. Because the plant reaches 125 cm, protect it from strong wind. After frost, remove the tuber and store it somewhere cool, dry, dark, and frost-free. This careful practice supports consistent flowering and strong healthy stems throughout summer. This careful practice supports consistent flowering and strong healthy stems throughout summer.
How should the tuber 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. This careful practice supports consistent flowering and strong healthy stems throughout summer. This careful practice supports consistent flowering and strong healthy stems throughout summer.
Wildlife and pets
Life,around your plants.
Supporting wildlife
Fully double Ferncliff Illusion 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. Ferncliff Illusion is a giant Dinnerplate dahlia with large double creamy white with lavender-purple tips flowers.
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