Himalayan knotweed 'Blackfield' 2L

Himalayan knotweed 'Blackfield' – Intense Red in the Garden

Himalayan knotweed 'Blackfield' (Persicaria amplexicaulis 'Blackfield') is an extremely striking variety of knotweed, known for its intense dark red inflorescences, which resemble ruby accents in the garden space. Its elegant appearance, long flowering period and ease of cultivation make it an excellent choice for any garden – from naturalistic to modern arrangements.

Main characteristics of Himalayan knotweed 'Blackfield'

Flowers

• Colour: A deep, dark red colour that retains its intensity throughout the flowering period.
• Shape: Slender, cylindrical panicles 10–15 cm long, hovering above the leaves.
• Flowering: From June to October, guaranteeing long-lasting decorativeness.

List

• Colour: Deep green, lanceolate, forming lush clumps.
• Decorativeness: The leaves provide a beautiful backdrop for the intense flowers, staying fresh throughout the season.

Cut

• Form: Compact, tufted, with erect flower stems.
• Height: It reaches about 80–100 cm, with a clump width of about 50–70 cm.

Cultivation requirements of knotweed 'Blackfield'

Location and soil

• Position: It grows best in sunny or semi-shaded places. In full sun, it blooms more intensely.
• Soil: Fertile, well-drained, constantly moderately moist. The plant also tolerates average soils if adequate moisture is ensured.

Watering and fertilizing

• Watering: Regular, especially during periods of drought. The soil should be constantly slightly moist, but not waterlogged.
• Fertilization: In spring, it is a good idea to apply an organic or compound fertilizer to support lush growth and flowering.

Care

• Trimming: After flowering, you can remove faded inflorescences to extend the decorative period of the plant and improve its appearance.
• Wintering: The plant is fully frost hardy (zone 5–8) and does not require special protection for the winter.

Application of Himalayan knotweed 'Blackfield'

Flower beds and garden compositions

• Perennial beds: It goes perfectly with plants with contrasting colors, such as coneflowers, asters, rudbeckias or ornamental grasses.
• Naturalistic plantings: An ideal choice for prairie, forest, or English style gardens.

Borders and tracks

• It works great as a border plant, introducing structure and intense color along paths or beds.

Group plantings

• In larger groups, it creates expressive red spots, which are a perfect accent in the garden.

Pots and terraces

• Thanks to its compact design, it is suitable for larger pots, perfectly decorating terraces and balconies.

Why choose Himalayan knotweed 'Blackfield'?

• Striking colours: Intense dark red flowers give the garden depth and elegance.
• Long flowering: Decorativeness from early summer to autumn makes the plant an ornament for many months.
• Easy care: It is an undemanding plant, resistant to diseases and easy to grow.
• Versatility: Ideal for any garden style, from modern to naturalistic.

Plant Specifications

• Flower pot: 2 liters
• Age: 2 years old
  
• Frost resistance: Yes