Aconitum carmichaelii ‘Arendsii’

Description

Aconitum carmichaelii ‘Arendsii’, also known as monkshood, is a hardy perennial that produces tall, striking spikes of deep violet-blue, hooded flowers. This elegant plant, reaching a height of 1.2 meters and a spread of 40 cm, adds a dramatic vertical element to borders and garden beds, flowering from August to September. Its dark green, deeply divided foliage complements its impressive flower spikes, making it a standout choice for late-season blooms

PLANTING and AFTERCARE GUIDE

Best Planting Time

Spring: Plant Aconitum carmichaelii ‘Arendsii’ in early spring, when the soil has warmed up, to encourage strong root development.

Autumn: Alternatively, plant in autumn, allowing the root system to establish before the next growing season.

Site Selection

Sunlight: For the best flowering results, Aconitum carmichaelii ‘Arendsii’ should be planted in full sun. However, it can also tolerate partial shade, especially in hotter regions where some afternoon shade will help the plant thrive.

Soil: This perennial prefers moist, well-drained soil. While it can adapt to different soil types, it thrives best in humus-rich, loamy soil that retains moisture but does not become waterlogged.

Planting Instructions

Preparing the Hole: Dig a hole twice as wide as the plant’s root ball and deep enough so that the crown of the plant sits at soil level.

Soil Preparation: Incorporate compost or well-rotted manure into the soil to enhance drainage and fertility.

Planting: Place the plant in the hole, ensuring the top of the root ball is level with the soil surface. Backfill the hole with soil, pressing it down firmly around the plant.

Watering: Water thoroughly after planting to settle the soil and help the plant establish.

Watering

Aconitum carmichaelii ‘Arendsii’ prefers consistently moist soil. Water regularly during dry periods, but avoid overwatering, as the plant dislikes soggy roots. Once established, the plant becomes more tolerant of occasional drought, but it will perform best with consistent moisture.

Feeding

Spring: Apply a balanced, slow-release fertiliser at the beginning of the growing season to promote strong growth and abundant flowering.

Mid-Season: A second feeding halfway through the growing season can help prolong the bloom period and maintain healthy foliage.

Pruning

Deadheading: Remove spent flowers to encourage the plant to continue blooming and maintain its neat appearance.

Autumn: After the plant finishes flowering, cut the stems back to ground level to prepare it for dormancy. This also helps to tidy up the garden in preparation for winter.

Mulching

Spring: Apply a layer of organic mulch around Aconitum carmichaelii ‘Arendsii’ to conserve moisture and suppress weed growth. This will also help regulate the soil temperature, keeping the roots cool during the summer months.

Winter: Mulch can also provide added protection for the roots during colder months, ensuring the plant’s survival into the next growing season.

Supporting the Plant

Aconitum carmichaelii ‘Arendsii’ produces tall flower spikes that may require support, especially in windy locations. Use stakes or plant supports to keep the stems upright and prevent bending or damage during gusty conditions.

Winter Care

In areas where winters are particularly harsh, consider adding a thicker layer of mulch to protect the root system from frost damage. Aconitum carmichaelii ‘Arendsii’ is hardy, but providing this extra protection will ensure it returns vigorously in the spring.

Final Tips

Aconitum carmichaelii ‘Arendsii’ is a striking perennial that brings a bold splash of colour to any garden in late summer and early autumn. Its deep blue, hooded flowers and upright form create a dramatic focal point, particularly when planted in groups or mixed with other late-season bloomers. With proper care, it will provide years of stunning displays and add vertical interest to your garden.

RHS Details

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