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Tuber
Asteraceae
Giant Dahlia ‘Labyrinth’ (Dahlia)
Dahlia × pinnata
Labyrinth produces 20 cm (8 in) double Dinnerplate flowers with long, twisted peach petals revealing a deep pink reverse. The No. 1 tuber forms an upright clump of about 90 cm (35 in) by 50 cm (20 in) according to Van Noort. Plant it 10 cm (4 in) deep in full sun, in fertile, humous, well-drained soil. Install a support early, pinch the young shoot, water deeply at the base, and remove spent flowers until frost. This sculptural dahlia is suitable for beds, large pots, and bouquets. In Quebec, lift the tuber in the fall and store it in a cool, dry, and frost-free place. Its shape remains unique.
- Quantity
- 1 tuber
- Exposure
- Sun
- Life cycle
- Tender perennial
- Hardiness
- Zone 8
Discover the plant
Common nameGiant Dahlia ‘Labyrinth’
FamilyAsteraceae
GenusDahlia
TypeTuber
Botanical nameDahlia × pinnata
Giant Dahlia 'Labyrinth' (Dahlia). Giant Dahlia 'Labyrinth' (Dahlia) 'Labyrinth' is a spectacular Dinnerplate dahlia with double flowers reaching 20 cm (8 in). Its long peach petals curl and twist, revealing their dark pink undersides and giving the flower head a swirling motion. The contrast changes with every angle, as if the color circulates between the petals. Van Noort's No. 1 tuber forms an upright clump approximately 90 cm (35 in) tall and 50 cm (20 in) wide, adorned with dark green foliage. From mid-summer until the first frost, new flowers emerge on stems suitable for beds, cutting gardens, and large containers. Their expressive form immediately becomes a focal point.
Plant the tuber in spring after the last frost, when the soil has warmed. Lay it 10 cm (4 in) deep, bud side up, in fertile, humus-rich, fresh, and well-drained soil. Leave 50 cm (20 in) around the crown, choose full sun, and protect the plant from strong winds. Install a support at planting to protect the 20 cm (8 in) flower heads. Water sparingly before emergence, then deeply at the base when the surface dries. Pinch back the young shoot to 20 to 30 cm (8 to 12 in) to encourage branching.
Mature compost and moderate fertilization, richer in potassium at the bud stage, promote strong stems without excessive tender foliage. Install 'Labyrinth' near a pathway to closely observe the twisted peach petals and their dark pink undersides. Pair it with midnight blue salvias, white gaura, chocolate cosmos, cream zinnias, and purple grasses. To obtain a giant flower head, keep the terminal bud and remove the lateral buds; to multiply stems, preserve natural branching. The very double flowers offer little access to pollinators, so add single-flowered neighbors. In Quebec, after the frost, lift the tuber, let its surface dry, label it, and store it in darkness, in a cool, dry, and frost-free place until spring.
Planting guide
Plant well.Grow beautifully.
Planting depth
10 cm (4 in)
Best planting time
Spring, when the ground is warm
Propagation
Division of tubers, each bearing a viable bud
Growing method
After the last frost, loosen a 12-inch (30 cm) sunny area and incorporate mature compost. Place the tuber horizontally 4 inches (10 cm) deep, bud side up, then leave 20 inches (50 cm) around the crown. Backfill without compacting and only water if the soil becomes dry before emergence. Pinch the shoot 8 to 12 inches (20 to 30 cm) above a pair of leaves. Immediately install a sturdy stake. When growth accelerates, water deeply at the base and fertilize sparingly, favoring potassium for the buds. Tie the stems with soft ties, harvest flowers when almost open, and remove faded flower heads. After frost, cut the stems, lift the tuber, let its surface dry, and store it in a cool, dry, frost-free place. The contrast between peach and dark pink remains sharper when the plant receives at least six hours of direct sun and regular feeding without excess nitrogen. An early-installed stake supports 8-inch (20 cm) flower heads after rain without compressing stems or damaging active roots. Remove faded flowers before seed formation so the clump directs its energy towards new buds until the first frost.
Soil and care
The right care,at the right time.
Soil pH
Slightly acidic to neutral
Minimum temperature
5 °C (41 °F)
Care level
Easy
Watering
Keep the soil consistently moist by watering regularly during growth. Adding organic mulch helps retain moisture and protects roots during hot periods. Water lightly before sprouting, then deeply at the base once the surface dries. In Quebec, after the frost, lift the tuber, let its surface dry, label it, and store it in a cool, dry, dark, and frost-free place until spring.
Soil type
Opt for humus-rich soil that retains moisture while allowing excess water to drain. Check the drainage after rain: water should be able to leave the root zone. Work the soil when it is crumbly to avoid compacting it. Adapt soil amendments to its actual texture. For container planting, use appropriate potting soil and a pot with drainage holes. Keep these openings clear and avoid any accumulation of water in the saucer.
Fertilization
Incorporate mature compost before planting. At the start, use a balanced formula low to moderate in nitrogen, then favor more potassium when buds appear. Follow the recommended dosage and water afterwards. Too much nitrogen produces tender stems and fewer flowers. The peach and dark pink contrast remains sharper when the plant receives at least six hours of direct sun and regular feeding without excess nitrogen.
Seasonal care
In spring, inspect the tuber, remove only rotten tissue, and plant after the last frost in warmed soil. Install support immediately. Until sprouting, avoid repeated watering. In early summer, pinch the shoot at 20 or 30 cm (8 to 12 in), tie new stems, and keep the soil moist without saturation. Once buds appear, fertilize moderately with more potassium. In summer, water deeply at the base during dry periods, harvest nearly open flowers, and continuously remove spent blooms. Monitor for slugs, aphids, earwigs, spider mites, and grey mold. After the first frost, cut the stems, gently lift the tuber, let its surface dry, label it "Labyrinth," and store it in a cool, dry, dark, and frost-free place. Check it monthly during winter. The peach and deep pink contrast remains sharper when the plant receives at least six hours of direct sun and regular feeding without excess nitrogen. An early-installed stake supports the 20 cm (8 in) flower heads after rain without compressing the stems or damaging active roots. Remove spent flowers before seed formation so the clump directs its energy toward new buds until the first frost. Always water slowly at the base, then let the top layer breathe to maintain a balance of moisture, oxygen, and drainage. The peach and deep pink hues pair particularly well with blue, white, purple perennials and airy grasses.
Container growing
A garden,within reach.
Recommended pot size
Container with a capacity of 40 to 50 L, deep and very stable
Container culture requires anticipating the necessary volume for the roots and the plant's final height. Choose a stable pot with drainage holes and a substrate suitable for planting. Leave enough space to respect the recommended depth and spacing, rather than crowding the plants to immediately fill the pot. Place the container in the indicated exposure and regularly check the moisture, especially in hot or windy weather. A pot is more exposed to temperature variations than planting directly in the ground. Therefore, plan an overwintering location from the outset that is compatible with the plant's needs and your region's climate. Plant in spring once all risk of frost has passed and the soil has sufficiently warmed. Choose a sunny location, sheltered from strong winds, in fertile and well-drained soil. Arrange the tuberous roots with their crown and buds facing upwards, without breaking the fragile attachments. Install a stake at the time of planting if support will be necessary, to avoid damaging the roots later. Water sparingly at the start, then adjust the water supply to the foliage growth. Constantly waterlogged soil around the tubers should be avoided, especially before the appearance of the first shoots. Plan to bring the storage organs indoors, away from frost, for the Quebec winter.
Bloom and dimensions
Its place,in your garden.
Mature height
110 cm (43 in)
Width / spread
50 cm (20 in)
Flower color
Peach with dark pink lapels
Foliage color
Green
Foliage type
Null and void
Growth rate
Quick
Bloom period
Abundant bloom of large decorative flowers in shades of pink, peach, and coral from July until the first frosts. Giant Dahlia ‘Labyrinth’ (Dahlia ‘Labyrinth’) Dahlia ‘Labyrinth’ is a spectacular Dinnerplate dahlia with double flowers reaching 20 cm (8 in). Mature compost and moderate fertilization, richer in potassium when buds form, promote strong stems without excessive tender foliage. The very double flowers offer little access to pollinators, so add single-flowered neighbors.
Harvest
July to October. Harvest the flowers when the flower heads are fully open for excellent vase life. Regularly remove spent flowers to prolong production.
Garden associations
In goodcompany.
Companion plants
To accompany Dahlia ‘Labyrinth’, you could consider cosmos, zinnias, or ornamental salvias. Choose companion varieties based on their height, flowering period, and the colors you wish to combine. Most importantly, ensure that their light exposure and water needs are suitable for the same location. Leave enough space so that leaves don't shade young shoots and so you can easily access each plant for maintenance. These combinations help to compose the garden's aesthetic; they do not guarantee protection against pests or diseases. Adjust the layout after observing one growing season.
Frequently asked questions
Your questions,answered.
When to plant Labyrinth dahlia?
Plant the tuber after the last frost, once the soil has warmed up and is no longer saturated. Lay it 10 cm (4 in.) deep, bud facing up, in fertile, humus-rich, well-drained soil. Leave 50 cm (20 in.) around the crown and install a support immediately. In cold regions, you can start it in a pot four to six weeks earlier, but gradually acclimate the shoot before planting it out. Water very little before emergence to prevent rot, then increase watering once roots and stems are active. Choose full sun to develop strong stems, generous flowers, and a well-defined peach color.
Why do Labyrinth's petals appear to move?
Labyrinth's long petals are naturally curved and twisted. Their peach-colored upper surface contrasts with a dark pink reverse, revealed at different angles by their undulations. On a flower head that can reach 20 cm (8 in), this alternation of color and direction creates a swirling effect, especially when the wind or light changes. This is not a deformation caused by a cultivation problem, but the desired characteristic of the cultivar. Place the plant near a pathway to observe this architecture. After a rain, support the stems and let the flowers dry naturally with good air circulation, without unnecessary handling.
How to get large Labyrinth flowers?
To encourage a particularly large flower head, retain the terminal bud on each main stem and remove the side buds while they are still small. This technique directs more energy towards a single bloom that can approach 20 cm (8 in.). Install support before the roots spread out and tie the stems with soft ties. Maintain consistent moisture without saturating the soil, feed moderately with more potassium when buds appear, and avoid excess nitrogen. Cut the flower when it is almost fully open, in the early morning, as a tight dahlia bud does not open well in a vase. Change the water daily and trim the stems slightly.
Can Labyrinth grow in a large pot?
Yes, choose a sturdy container that is 40 to 50 L in size, deep, well-drained, and filled with rich but aerated potting soil. Plant a single tuber 10 cm (4 in) deep and insert the support before the roots develop. Place the pot in full sun, protected from gusts of wind. Water sparingly before sprouting, then abundantly when the top layer dries, without leaving water in the saucer. Apply a moderate liquid fertilizer, richer in potassium as soon as buds appear. Turn the container weekly, pinch off young shoots to encourage branching, and remove faded flowers to maintain a balanced shape and abundant flowering.
How to winterize Labyrinth in Quebec?
After the first frost blackens the foliage, cut back the stems, leaving a short stub. Lift the tuber with a fork, working far enough away so as not to damage it. Gently remove excess soil, let the surface dry in a well-ventilated place, and clearly label it Labyrinth. Store it in a dark, cool, dry, and frost-free place, in a slightly insulating material that limits drying without retaining water. Inspect it monthly. Remove only the parts showing active rot and increase ventilation if condensation appears. Wait until after the last spring frost and for the soil to warm up before replanting.
Wildlife and pets
Life,around your plants.
Supporting wildlife
The very double florets limit access to pollen and nectar. Labyrinth contributes mainly to ornamental value. To feed bees and butterflies, plant sages, verbenas, coneflowers or other simple flowers rich in resources nearby. The contrast between peach and dark pink remains sharper when the plant receives at least six hours of direct sunlight and regular feeding without excess nitrogen.
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