Purple loosestrife Lythrum salicaria 'Robert' pot

Size: Potmaat leidend

5-10cm

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Pot 9x9 cm (P9)

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Available from: 03/02/2025
- 5-10cm
  
  |
  
  Pot 9x9 cm (P9)
  
  |
  
  From 3.20
  
  |
  
  Available from: 03/02/2025
- 10-15cm
  
  |
  
  Pot 2 ltr. (C2)
  
  |
  
  From 9.70
  
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  Temporarily sold out

Number of m2

Nr. of plants

3.20

3.20 per piece

incl. VAT, excl. shipping costs (calculated in shopping cart)

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Benefits according to our specialist

Plantable year-round
Rich flowering
Fast-growing

Plant features
Description
Planting and care
Packaging and shipping

Genus
Lythrum (view all varieties)

Root type
Pot

Pot size
9x9 cm (P9)

Flowering months
June, July, August

Leaf colour
Red, Pink

Possibilities
Border, Group planting

Soil type
All soil types, well-drained

Positioning
Semi-shade, Sun

Winter hardiness
-23,3°C / -20,6°C, USDA zone 6a

Fruit-bearing plants
No

Water needs
Average water

Number of plants per m²
6

Evergreen plants
No

Leaf colour
Green

Fragrant plants
No

Growth habit
Upright growth habit

Height at time of delivery excluding pot/clod
5-10

Mature height (cm)
70

Art. no.
1000765

Description

Lythrum salicaria 'Robert' | Purple loosestrife

The Lythrum salicaria 'Robert', commonly referred to as purple loosestrife, is a perennial favorite among gardeners for its vibrant summer blooms and upright growth habit. This robust and decorative plant is a delightful addition to any border or group planting, offering a splash of color with its stunning pink flowers during the warmest months of the year.

Key Features

The Lythrum thrives in a wide range of well-drained soils, and its adaptability makes it suitable for many garden settings.
It displays an upright growth habit, reaching an ultimate height of approximately 70 cm, which allows it to stand out in garden borders.
The flowering period spans from June to August, with the plant producing a profusion of pink blooms that attract pollinators and add visual interest to any landscape.
While the plant is deciduous, its foliage remains a lush green from spring through autumn, providing a backdrop of verdant color in the garden.

Tips

To ensure the health and vigor of Lythrum salicaria 'Robert', it is recommended to divide the plant in spring or autumn. This process rejuvenates the plant and stimulates robust growth.
Regular watering is necessary for the purple loosestrife, particularly during dry periods, as it does not exhibit drought resistance.
To maintain a neat appearance and encourage continuous blooming, faded flowers should be removed as soon as they begin to wilt. This practice also prevents the plant from unwanted seeding, promoting a more controlled growth in your garden.

Ideal placement of a Lythrum salicaria 'Robert'

Lythrum salicaria 'Robert' prospers in locations that receive full sun to partial shade, with the sunnier spots encouraging more vibrant and abundant blooming. This species is adaptable to various soil conditions, provided they are well-drained. It is important to ensure that the soil does not become waterlogged to maintain optimal plant health. With its upright growth habit, it reaches an ultimate height of approximately 70 cm, making it a striking addition to borders and group plantings where its pink summer blooms can truly stand out.

How do I plant a Lythrum salicaria 'Robert'?

To plant Lythrum salicaria 'Robert', select a location that receives full sun to partial shade and ensure the soil is well-drained. Although adaptable to various soil types, this species thrives best in moist, fertile earth. Plant in a hole twice as wide as the pot and to the same depth, spacing individuals approximately 45-60 cm apart to accommodate the upright growth habit. Water the plant thoroughly after planting to settle the soil around the roots and maintain an average watering schedule, especially during dry spells, as this plant does not exhibit strong drought resistance.

Pruning a Lythrum salicaria 'Robert'

Pruning of Lythrum salicaria 'Robert' should be timely to ensure a tidy appearance and encourage a robust growth cycle. As the blossoms begin to fade during the flowering months, it is advisable to deadhead the spent flowers. This process not only enhances the overall look of the specimen but also stimulates further blooming and prevents self-seeding that could lead to excessive spread. Regularly checking and removing the wilting flowers will keep the plant's energy focused on producing vibrant new blooms and lush foliage.

Watering a Lythrum salicaria 'Robert'

Ensuring adequate hydration is vital for the flourishing of this species, which exhibits an average water need. While it is robust enough to adapt to various conditions, the plant thrives with consistent moisture, particularly during the active growing season in the warmer summer months. It is recommended to establish a regular watering schedule that keeps the soil evenly moist but not waterlogged, as well-drained soil is essential for optimal health. During periods of drought or extreme heat, increase the frequency of watering to maintain soil hydration and support the plant's lush green foliage and vibrant summer blooms.

Fertilising a Lythrum salicaria 'Robert'

To maintain the robust growth and vibrant blooms of Lythrum salicaria 'Robert', proper fertilization is essential. This species thrives with a fertilization regimen starting in early spring, as new growth appears, and a follow-up application in mid-summer to support its lengthy flowering period. A balanced, slow-release fertilizer applied around the base of the plant encourages the development of its striking red and pink flowers.

It is recommended to lightly incorporate the fertilizer into the soil to facilitate nutrient absorption without disturbing the roots. Watering the area after fertilizing helps to carry the nutrients to the root zone, ensuring that the plant receives the full benefit of the application. Regular feeding, matched with its average water needs, will keep this species flourishing throughout its active growing months.

The characteristics of a Lythrum salicaria 'Robert'

Lythrum salicaria 'Robert' thrives in moist soils, making it an excellent choice for waterside gardens or natural rain gardens. Its robust root system can help stabilize soil in areas prone to erosion. This cultivar's vibrant purple spires add a vertical dimension to any planting arrangement and are particularly attractive when grouped. Moreover, their lengthy blooming period from mid-summer to early autumn provides extended visual interest and a succession of color in the landscape.

Separating/dividing a Lythrum salicaria 'Robert'

To ensure continued health and vitality, division of this species is recommended every few years. The process involves carefully lifting the plant from the soil and separating it into smaller sections, each with several shoots and a healthy root system. Replant these divisions promptly to enjoy the plant's vigorous upright growth and striking summer blooms. Division not only rejuvenates the plant but also helps to manage its size and shape. The optimal times for this task are during the cooler temperatures of spring or autumn, which allows the divisions to establish without the stress of extreme heat.

What will be the height of Lythrum salicaria 'Robert'?

Lythrum salicaria 'Robert' typically reaches a height between 50 centimeters and 1 meter when fully mature.

What will be the width of Lythrum salicaria 'Robert'?

Lythrum salicaria 'Robert' attains a maximum spread ranging from 10 centimeters to 50 centimeters as it reaches maturity.

Which soil type is most suitable for the Lythrum salicaria 'Robert'?

Lythrum salicaria 'Robert' can thrive in a wide range of soil types, as long as the soil is well-drained. Ensuring proper drainage allows the plant to prosper by preventing waterlogging and promoting healthy root development.

What is the ideal positioning for the Lythrum salicaria 'Robert'?

The ideal location for Lythrum salicaria 'Robert' is an area that receives either full sun or partial shade. This plant can thrive in both light conditions, making it adaptable to various settings in a garden or landscape.

What is the flowering colour of the Lythrum salicaria 'Robert'?

The flowering color of Lythrum salicaria 'Robert' includes shades of red and pink, adding a vibrant and captivating touch to the plant's appearance.

Is the Lythrum salicaria 'Robert' hardy?

Yes, Lythrum salicaria 'Robert' is indeed winter hardy. It can endure temperatures ranging from approximately -23.3°C to -20.1°C, falling within the USDA hardiness zone 6a. This indicates that Lythrum salicaria 'Robert' is well-equipped to withstand the typical winter conditions in many regions.

Is the Lythrum salicaria 'Robert' evergreen?

Lythrum salicaria 'Robert' is not an evergreen plant. It is deciduous, shedding its leaves during the autumn season and regrowing them in the spring.

What is the growth strength of the Lythrum salicaria 'Robert'?

Lythrum salicaria 'Robert' typically reaches its ultimate height within a span of two to five years, signifying a moderate yet steady growth rate.

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