Actaea japonica Cheju-do

Description

Pot size: 3 litre pot
Plant size after 3 years: Up to 1 meter high, with a spread of 0.5 metres

Foliage and flower colour: Deep green, finely divided foliage; small white flowers blooming in summer (June to July)

GardenAdvice notes

Actaea japonica ‘Cheju-do’ is a perennial plant belonging to the Ranunculaceae (buttercup) family, native to East Asia, particularly Japan and South Korea. The ‘Cheju-do’ cultivar originates from Jeju Island (formerly known as Cheju-do) in South Korea. This plant is valued for its attractive, deeply cut foliage and delicate white flowers that bloom in the summer, followed by ornamental white berries in the autumn. These berries add a striking visual interest to shaded garden areas late in the season. Actaea japonica ‘Cheju-do’ thrives in woodland settings and is an excellent choice for adding texture and depth to shaded borders or underplanting beneath trees. Historically, species of Actaea have been used in traditional medicine in their native regions, though caution is advised as parts of the plant are toxic if ingested.

Soil type

Actaea japonica ‘Cheju-do’ grows best in moist, fertile, humus-rich soil that is well-draining. It prefers a neutral to slightly acidic pH. Enhancing the soil with organic matter such as compost or well-rotted leaf mould will improve moisture retention and nutrient availability, promoting healthy growth. Avoid overly dry or waterlogged conditions, as the plant does not tolerate drought or standing water.

Location and aspect

This plant flourishes in partial to full shade, emulating its natural woodland habitat. An east or north-facing aspect is ideal to protect it from harsh afternoon sun, which can scorch the foliage. Actaea japonica ‘Cheju-do’ is well-suited for shaded borders, woodland gardens, or as an understorey planting beneath trees and larger shrubs. Providing a sheltered location will help safeguard it from strong winds that can damage the delicate leaves.

Pest and disease problems

Actaea japonica ‘Cheju-do’ is generally resistant to pests but can occasionally attract slugs and snails, which may feed on young shoots and leaves. To manage these pests, use slug pellets, traps, or organic barriers like crushed eggshells around the base of the plant. The plant may be susceptible to fungal diseases such as powdery mildew or leaf spot in conditions of poor air circulation or excessive moisture. To prevent fungal issues, ensure good spacing between plants for air flow, avoid overhead watering, and plant in well-draining soil. If fungal diseases occur, remove and destroy affected foliage and consider applying an appropriate fungicide.

Propagation

Propagation of Actaea japonica ‘Cheju-do’ can be achieved through seed or division. Seed sowing should be done in autumn or early spring; however, germination can be slow and irregular due to seed dormancy. For more immediate and reliable results, division is recommended. The optimal time for division is in early spring or autumn when the plant is dormant or just beginning new growth. Carefully dig up the plant and separate the root clumps, ensuring each division has healthy buds and roots attached. Replant the divisions promptly into prepared soil, water thoroughly, and maintain consistent moisture as they establish.

Pruning, cutting back, and dividing

Minimal pruning is required for Actaea japonica ‘Cheju-do’. Remove spent flower stems after blooming and trim any dead or damaged foliage in late autumn or early spring to maintain a neat appearance. Dividing the plant every few years not only rejuvenates it but also allows you to propagate new plants. Perform divisions in early spring or autumn for the best results.

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Plant available on the GardenAdvice plant swap and root, shoots, and share schemes.

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