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Karma Maarten Zwaan Dahlia Tubers

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  • Colour: White
  • Flower Size: 14cm
  • Type: Decorative waterlily
  • Cutting: Yes
  • Height/spread: 90cm x 60cm
  • Flowering: Jul - Nov
  • Planting Months: Mar - Jul
Choose a size

Sold as "single tubers", meaning a clump of connected tubers produced by one plant in one year.

A dahlia plant's size is independent of the tuber: some tall varieties with big flowers have small tubers, some short varieties with small flowers have large tubers.

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Tubers
£4.95each
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£ 4.95
£ 3.95
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Description

Karma Maarten Zwaan Dahlia Tubers

A vision of sophistication and grace, the magnificent white waterlily flowers of Karma Maarten Zwaan will brighten the garden throughout summer and well into autumn. Fully-double white blooms soften to a creamy yellow at the centre of layer upon layer of loosely-packed, slightly incurved petals and reach an impressive 14cm in diameter. Originally developed as a cut flower, this fabulous dahlia has strong stems and excellent longevity in a vase.

Browse our other Waterlily varieties or see our full range of Dahlias here.

Features

  • Colour: White
  • Flower Size: 14cm
  • Type: Decorative waterlily
  • Cutting: Yes
  • Height/spread: 90cm by 60cm
  • Flowering: July to November
  • Planting Months: March to July

How to Grow Karma Maarten Zwaan Dahlias

Dahlias like deep, fertile soil with good drainage and this compact variety is ideal for the middle of a sunny border. Add stakes at planting time, so support is available when it is needed.

Water well in dry periods and keep your dahlias flowering prolifically throughout summer and autumn by adding a bit of soluble food in the watering can once every couple of weeks. Dahlias grown in containers need to be kept especially well watered and fed.

Planting Companions for Karma Maarten Zwaan

Combine with other waterlily dahlias like deep maroon Sam Hopkins and golden yellow Glorie van Heemstede to create a dramatic impact, or blend into white borders alongside Echinacea 'White Swan', Salvia x sylvestris 'Schneehugel' and white-flowered shrubs like Choisya x dewitteana 'White Dazzler'.

Ideal in container displays, the pure white blooms make a spectacular contrast to the scarlet flowers and dark foliage of Canna 'Tropicanna Black' and the deep purple leaves of Colocasia 'Black Magic'.

Planting Instructions

Unless they are grown from seed, Dahlias can be planted at three stages: as tubers, rooted cuttings and pot-grown plants.

Tubers can be planted at any time from March onwards. The hole should be at least double the diameter of the tuber laid out on the ground. Incorporate about 25% well rotted compost and add plenty of horticultural grit if drainage is in any way doubtful. Plant one tuber per hole, leaving 60-80cms between plants (depending on final size) and make sure the tuber is covered with 10-12cms (4-5") of soil. This will insulate the tuber against frosts in March-May as they will take a couple of months to show.

Rooted cuttings (available from early April onwards) will need to be potted up and kept in a sunny and frost free place until they are ready to be planted out in mid May. Their treatment then is the same as for tubers except they are planted level with rather than 10cms below the surrounding soil level.

Pot grown plants are not delivered until June, and should be planted out immediately in the same way as an established rooted cutting.

Deadhead regularly to encourage more flowers over a longer period.

Did You Know?

The Karma Dahlia Series was developed between 1993 and 2017 by Dutch breeder, Verwer. With their sturdy stems and long vase life of up to 12 days, they are among the best for cutting.

The pure white Maarten Zwaan was added to the Karma collection in 2001, along with Karma's Fuchsiana, Corona, Ventura and Bon Bini.

What to expect

It's Spring Planting Season 2025

Pot grown plants on the nursery

Pot Grown & Plug Plants Delivered

From seedlings in jumbo plugs; Dahlia tubers; small P9 & 1 Litre plants; up to trees in big 15L pots
Expertly packed plants ready for delivery

Direct from the Nursery Value

We work with large batches of orders to save you money. Lead times for plants in stock are around 2 weeks
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No more broken plants in the post!

When your order is ready, it's expertly packed by Rodney and delivered by next day courier; if anything goes wrong, call Dan on 01963 359 444
Planting out potted plants in Spring

Spring is perfect planting time

Roots love the warm soil; the plant has time to settle in before mid-Summer heat
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