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Tuber
Asteraceae
Waterlily Dahlia 'Karma Maarten Zwaan' (Dahlia)
Dahlia × pinnata
Dahlia ‘Karma Maarten Zwaan’ (Dahlia × pinnata ‘Karma Maarten Zwaan’) is a refined tuberous perennial distinguished by its slightly creamy white flowers, perfectly arranged like waterlily petals. Their regular, broad, and balanced shape creates a luminous bloom above dark green foliage that accentuates their purity. From July to October, flowers generously renew on plants reaching about 90 cm (35 in.) in height. This variety brings simplicity, elegance, and freshness to summer arrangements. Not hardy in Quebec, it must be overwintered in a frost-free environment. Plant the tuber in spring, once all risk of frost has passed, about 10 cm (4 in.) deep in rich, loose soil, enriched with compost, and perfectly drained.
- Quantity
- 1 tuber
- Exposure
- Sun
- Life cycle
- Tender perennial
- Hardiness
- Zone 8
Discover the plant
Common nameDahlia 'Karma Maarten Zwaan'
FamilyAsteraceae
GenusDahlia
TypeTuber
Botanical nameDahlia × pinnata
Dahlia Water Lily 'Karma Maarten Zwaan' (1 tuber) – Pure and refined elegance! ??offered by Van Noort
Dahlia Water Lily 'Karma Maarten Zwaan' is an exquisite variety distinguished by its bright white flowers of incomparable grace. With its gently curved petals and subtle heart, it brings a touch of sophistication to gardens and bouquets. Its abundant and prolonged flowering from June to the first frosts makes it a favorite choice for cut flowers and elegant borders .
?? Characteristics of the variety
?? Height : 80 cm (32")
?? Flower size : 13 cm (5")
?? Exposure : Full sun
?? Hardiness : Not hardy (dig up the tubers before winter)
?? Deer resistance : Low (they may be interested!)
?? Water requirements : Medium (moist but well-drained soil)
?? Ideal soil : Loamy or sandy, well drained, acidic to neutral pH
?? Quantity : 1 tuber
?? Planting and growing Dahlia 'Karma Maarten Zwaan'
?? When to plant?
??? From March to May , after the last frosts.
?? Where to plant it?
?? In open ground : Ideal for elegant and bright flowerbeds .
?? In pot : Suitable for large, well-drained containers.
?? How to plant?
1?? Soak the tuber in water a few hours before planting.
2?? Plant 4 cm deep , spacing the plants 50 cm apart.
3?? Add a discreet stake to support the stems during flowering.
4?? Water regularly , without excess to avoid rotting the tubers.
?? Tip : Pair it with pink or purple Dahlias for a romantic and refined contrast !
?? Maintenance of the Dahlia 'Karma Maarten Zwaan'
?? Watering : Keep the soil slightly moist, especially during dry periods.
?? Fertilizer : Add a potassium-rich fertilizer every two weeks for prolonged flowering.
?? Pruning : Remove faded flowers to stimulate new growth.
?? Wintering :
?? Dig up the tubers in the fall , let them dry and store them in a cool, dry place.
?? Why choose the Dahlia 'Karma Maarten Zwaan'?
? Bright and abundant flowering
? Ideal for illuminating a flowerbed with its immaculate flowers
? Perfect for bouquets thanks to its strong and durable stems
? Easy to grow and maintain
? Add a touch of purity and elegance to your garden with the Dahlia 'Karma Maarten Zwaan'! ?
?? Pair with pink, red or purple Dahlias for a garden with enchanting contrasts! ??
Planting guide
Plant well.Grow beautifully.
Planting depth
10 cm (4 in)
Best planting time
Spring
Propagation
Divide the tubers in spring when each section has at least one viable eye. This method faithfully preserves all the qualities of this variety.
Growing method
Plant in spring after all risk of frost has passed and the soil has warmed sufficiently. Choose a sunny location, sheltered from strong winds, in fertile, well-drained soil. Arrange the tuberous roots with their crown and buds pointing upwards, without breaking the fragile connections. Install a stake at the time of planting if support will be needed, to avoid damaging the roots later. Water sparingly at the beginning, then adjust the watering according to the foliage growth. Constantly soggy soil around the tubers should be avoided, especially before the first shoots appear. During the summer, water at the base when the soil dries out and tie the stems as needed with flexible ties. Regularly remove faded flowers to encourage the formation of new buds. For bouquets, choose well-opened flowers and use a clean tool for a clean cut. In autumn, plan for wintering the tubers in a frost-free place: dahlias do not overwinter in the ground in Quebec. After the vegetation dies back, carefully dig up the clump, let its surface dry, and store it in a cool, airy, frost-free place. Inspect it periodically for damaged parts.
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
Water regularly to maintain uniformly moist soil without creating standing water. An organic mulch helps retain moisture during hot spells. Before watering, check the moisture level below the surface with your finger rather than following a fixed schedule. Recent rain, wind, and container growing can quickly alter needs. Direct water to the soil, at the base of the plant, and allow excess to drain freely.
Soil type
Prioritize loose, well-drained soil, where water does not linger around roots or bulbs. Check drainage after rain: water should be able to drain away from the root zone. Work the soil when it is dry to prevent compaction. Adapt amendments to its actual texture. For container plants, use appropriate potting mix and a pot with drainage holes. Keep these openings clear and avoid any accumulation of water in the saucer.
Fertilization
Before adding fertilizer, consider the richness of your soil and any previous applications. A soil analysis can help you choose the most useful amendments. If you use a fertilizing product, follow the dosage, frequency, and application method indicated on its packaging. Avoid concentrated applications directly against the roots. Do not use multiple products: an excessive amount of fertilizer does not guarantee better growth or more abundant flowering.
Seasonal care
Plant in spring once all risk of frost has passed and the soil has sufficiently warmed. Choose a sunny spot, sheltered from strong winds, in fertile, well-drained soil. Arrange the tuberous roots with their crown and buds facing upwards, being careful not to break the fragile connections. Install a stake at planting time if support will be needed, to avoid damaging the roots later. Water sparingly at the start, then adjust watering based on foliage growth. Avoid constantly soggy soil around the tubers, especially before the first shoots appear. During the summer, water at the base when the soil dries out and tie up stems as needed with flexible ties. Regularly remove faded flowers to encourage the formation of new buds. For bouquets, choose fully open flowers and use a clean tool for a neat cut. In the fall, plan to overwinter the tubers in a frost-free location: dahlias do not overwinter in the ground in Quebec. After vegetation ends, carefully dig up the clump, let its surface dry, and store it in a cool, airy, frost-free place. Inspect it periodically for damaged parts. Throughout the seasons, observe new shoots, soil moisture, and the condition of the stems. A durable label helps locate the planting during its dormancy. Clean tools after cutting diseased parts and remove degrading debris from around the base.
Container growing
A garden,within reach.
Recommended pot size
40 cm (16 in.)
Container gardening requires anticipating the volume needed for the roots and the final height of the plant. 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 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 a plant in the ground. Therefore, plan for a wintering location compatible with the plant's needs and your region's climate from the outset. Plant in spring when all risk of frost has passed and the soil is sufficiently warmed. Choose a sunny spot, 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 planting if support will be necessary, to avoid injuring the roots later. Water sparingly at the start, then adapt watering to foliage growth. Consistently waterlogged soil around the tubers should be avoided, especially before the first shoots appear. Plan to bring in storage organs indoors, away from frost, for the Quebec winter.
Bloom and dimensions
Its place,in your garden.
Mature height
90 cm (36 in)
Width / spread
40 cm (16 in.)
Flower color
Creamy white
Foliage color
Dark green
Foliage type
Obsolete
Growth rate
Quick
Bloom period
The flowers attract pollinators and have an excellent vase life. Their regular, broad, and balanced shape creates a luminous bloom above dark green foliage that accentuates their purity. Dahlia 'Karma Maarten Zwaan' is ideal for white gardens, romantic beds, borders, large containers, and cutting gardens. Weather conditions and the stage of development at the time of planting can affect the appearance of the flowers.
Harvest
July to October. Harvest the flowers early in the morning when they are fully open for excellent vase life. Continue to remove spent blooms to prolong flowering.
Garden associations
In goodcompany.
Companion plants
To accompany Dahlia 'Karma Maarten Zwaan', you can consider cosmos, zinnias, or ornamental sages. Choose neighboring varieties based on their height, flowering period, and the colors you wish to combine. Most importantly, ensure that their sun exposure and water requirements are suitable for the same location. Maintain enough distance so that leaves do not shade young shoots and so that each plant is easily accessible for maintenance. These combinations are intended to compose the garden's decor; they do not guarantee protection against pests or diseases. Adjust the layout after observing one growing season.
Frequently asked questions
Your questions,answered.
How to successfully plant Dahlia 'Karma Maarten Zwaan' waterlily?
Plant in spring once all risk of frost has passed and the soil has warmed sufficiently. Choose a sunny spot, sheltered from strong winds, in fertile, well-drained soil. Arrange the tuberous roots with their crown and buds facing upwards, without breaking the fragile attachments. Install a stake at planting if support will be needed, to avoid damaging the roots later. Water sparingly at first, then adjust as foliage grows. Avoid constantly soggy soil around the tubers, especially before the first shoots appear.
What light should I provide for Waterlily Dahlia 'Karma Maarten Zwaan'?
The recommended exposure is full sun. Observe the light in your chosen spot in the morning and afternoon, as the shade from trees or buildings changes throughout the day. Also consider neighboring plants: their foliage can obscure a young planting as it develops. In a container, place the pot where you can move it if conditions become too hot or too shady. Suitable exposure must go hand in hand with proper soil and watering. If you move a plant started indoors to the outdoors, gradually accustom it to garden conditions to avoid too abrupt a transition for young leaves.
How to adjust watering?
Water according to the actual soil moisture, taking into account rain, heat, and wind. Check below the surface before deciding to water again: soil that is dry on the surface may still be moist at root level. Direct water to the base of the plant and allow it to penetrate, without keeping the plant in saturated soil. Containers generally require more frequent checks because they dry out faster. Make sure their drainage holes remain clear and empty any saucers that retain water. Also adapt care to the plant's cycle: active growth and a dormant period do not require the same amount of water.
What should you plan for growing in containers?
Container gardening requires planning for the necessary volume for the roots and the plant's final height. Choose a stable pot with drainage holes and a suitable potting mix. Leave enough space to respect the recommended depth and spacing, rather than crowding 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 a plant in the ground. Therefore, from the outset, plan for a wintering location compatible with the plant's needs and your region's climate.
What care should be provided after the growing season?
During the summer, water at the base when the soil dries out and tie the stems as needed with flexible ties. Regularly remove faded flowers to encourage the formation of new buds. For bouquets, choose fully open flowers and use a clean tool to make a clean cut. In the fall, plan to overwinter the tubers away from frost: dahlias do not overwinter outdoors in Quebec. After the growing season ends, carefully dig up the clump, let its surface dry, and store it in a cool, airy, frost-free place. Periodically inspect it for damaged parts.
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