Aconitum Arendsii


7 in stock

SKU: aconitum-arendsii Category:
Common Name: Monk's Hood
Size: 2-3 Litre
Hardiness: H7
Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees ˚C) are shown in brackets

  • H1a: under glass all year (>15˚C)
  • H1b: can be grown outside in the summer (10 - 15 ˚C)
  • H1c: can be grown outside in the summer (5 - 10 ˚C)
  • H2: tolerant of low temperatures, but not surviving being frozen (1 to 5 ˚C)
  • H3: hardy in coastal and relatively mild parts of the UK (-5 to 1 ˚C)
  • H4: hardy through most of the UK (-10 to -5 ˚C)
  • H5: hardy in most places throughout the UK even in severe winters (-15 to -10 ˚C)
  • H6: hardy in all of UK and northern Europe (-20 to -15 ˚C)
  • H7: hardy in the severest European continental climates (< -20 ˚C)
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This plant has won a RHS award

2-3 Litre Pot

  • RHS Award of Garden Merit
  • Position: Full sun, partial shade
  • Soil: Moist, well drained
  • Growth Rate: Average
  • Flowering Period: Autumn
  • Hardiness: H7
  • Eventual Height: 1 – 1.5m
  • Eventual Spread: 0.1 – 0.5m

Aconitum Arendsii, commonly known as ‘Monk’s Hood, is a striking herbaceous perennial plant that belongs to the buttercup family. Native to Europe and Asia, this plant is a favourite among gardeners for its stunning display of violet-blue flowers that bloom in late Summer to early Autumn.

The plant grows to a height of around 1.5 metres, with dense, erect stems that are covered in deeply lobed, dark green leaves. The striking flowers grow in dense spikes and are bell-shaped, with a distinctive hooded appearance that gives them their common name. The flowers can range in colour from deep violet-blue to pale lavender, depending on the cultivar.

This is a hardy and reliable plant, with a clump-forming habit that makes it ideal for growing in mixed borders, cottage gardens, or as a dramatic accent plant. It prefers moist, well-drained soils and partial shade, but can tolerate full sun in cooler climates. Like all members of this genus, this plant is highly toxic if ingested, so care should be taken to keep it away from children and pets. With its stunning display of vivid blue flowers and lush green foliage, this is a must-have for any serious gardener looking to add a touch of drama and colour to their landscape.


How to care for your Aconitum Arendsii

  • Soil: Prefers well-drained, fertile soil. It is important to ensure that the soil remains moist but not waterlogged, as this can lead to root rot.
  • Sun and shade: Prefers partial shade, but can tolerate full sun in cooler climates. It is important to avoid planting it in areas that receive intense, direct sunlight, as this can cause the plant to wilt and the flowers to fade more quickly.
  • Watering: It is important to keep the soil around the plant consistently moist, but not water logged. During periods of drought, be sure to water the plant regularly to prevent the soil from drying out completely.
  • Fertiliser: Does not require heavy fertilisation. A light application of balanced fertiliser in the early Spring should be sufficient to encourage healthy growth and blooming.
  • Pruning: After the flowers have faded, cut back the stems to just above the ground. This will help to prevent the plant from becoming too leggy and encourage bushier growth the following season.
  • Mulching: Benefits from a layer of organic mulch around its base. This will help to retain moisture in the soil and protect the plant from extreme temperatures.
  • Propagation: Can be propagated by division in the Spring or Autumn. Simply dig up the plant, separate the clumps, and replant in a well-prepared soil.

By following these basic care guidelines, you can help to ensure that your Aconitum Arendsii remains healthy, vibrant, and blooming year after year.