Care Instructions for Cryptomeria japonica Compressa, The Dwarf Japanese Cedar

Care Instructions for Cryptomeria japonica Compressa

The Dwarf Japanese Cedar

Cryptomeria japonica 'Compressa', commonly known as the Dwarf Japanese Cedar, is a compact, columnar conifer that is perfect for adding structure and year-round interest to smaller gardens, rockeries, or as a striking architectural feature in containers. With its dense, vertically growing form and soft, needle-like foliage, ?ompressa?is a versatile and low-maintenance tree that thrives in the UK climate. At Lakeside Tree Nursery, we?e delighted to offer this unique variety, and we?e here to guide you on how to care for it properly.

1. Planting Location

Cryptomeria japonica 'Compressa' thrives in a well-drained, fertile soil and is best placed in a sunny or partially shaded location. While it will tolerate some shade, planting it in full sun encourages the best growth and brings out its rich green colour.

Soil: Prefers slightly acidic to neutral, well-draining soil. It will not tolerate waterlogged conditions, so ensure good drainage, especially in clay-heavy soils.

Space: 'Compressa' is a relatively small, slow-growing variety, typically reaching a height of around 1.5m and a spread of 60-90cm at maturity. Space plants around 60-90cm apart if planting in groups, and give it a little more room if planted as a standalone specimen.

2. Watering

Once established, Cryptomeria 'Compressa' is relatively drought-tolerant but will benefit from consistent moisture, especially in dry periods.

Young Plants: Water regularly in the first year to help establish a strong root system. Ensure the soil remains evenly moist, but avoid waterlogging.

Mature Plants: Once established, water during particularly dry spells, especially in containers or more exposed areas. Allow the top 2-3cm of soil to dry out between waterings to prevent root rot.

3. Feeding

Cryptomeria 'Compressa' is not a heavy feeder, but it will appreciate a light feed to support healthy growth and maintain vibrant foliage.

Spring Feeding: Apply a balanced, slow-release fertiliser in early spring, just before the growing season begins. An organic fertiliser or well-rotted compost can also be used to feed the plant naturally.

Avoid Overfeeding: Excessive feeding, especially with nitrogen-rich fertilisers, can result in overly lush, soft growth that is more susceptible to frost damage. Stick to light, balanced feeding for the best results.

4. Pruning & Maintenance

One of the best features of Cryptomeria 'Compressa' is its naturally dense, columnar shape, which requires minimal pruning. However, occasional maintenance can help keep it looking its best.

Light Pruning: Prune lightly in early spring or late winter to remove any dead, damaged, or crossing branches. This will help maintain a tidy, healthy appearance.

Shaping: If you wish to control its height or shape, you can lightly trim the top or sides, but be cautious not to cut into older, woody growth. Pruning should be minimal as the tree? natural form is quite elegant.

Deadheading: Although Cryptomeria 'Compressa' doesn? produce showy flowers, it's still worth checking for any dead or spent growth, especially after harsh winters. Trim any unwanted growth for a clean look.

5. Winter Care

While Cryptomeria japonica 'Compressa' is hardy in the UK, it? still important to protect the plant, particularly in its early years or during particularly severe winters.

Frost Protection: Young trees may benefit from a layer of mulch around the base to protect the roots from winter frost. You can also cover them with horticultural fleece during particularly harsh weather.

Winter Colour: During colder months, the foliage of 'Compressa' will take on a richer, deeper green and may have a slightly bronze tint. This colour change adds winter interest and is part of the tree? natural seasonal cycle.

6. Pests & Diseases

Cryptomeria 'Compressa' is generally free from major pests and diseases, though there are a few things to watch out for:

Root Rot: Ensure the plant is not sitting in waterlogged soil, as poor drainage can lead to root rot. Well-drained soil is essential for healthy root growth.

Scale Insects: These pests can occasionally appear on conifers but are generally easy to manage. A soft brush or insecticidal soap can be used to remove them if necessary.

Needle Discolouration: Yellowing or browning needles may indicate environmental stress, such as underwatering, overwatering, or exposure to extreme temperatures. Ensure the plant is not exposed to drought or waterlogged soil conditions.

7. Mulching

Applying mulch is beneficial for maintaining soil moisture, suppressing weeds, and insulating the roots during winter. A 5?cm (2? inches) layer of organic mulch around the base of the tree is ideal.

Avoid Mulching Too Close to the Trunk: Be sure to leave a gap around the trunk to prevent moisture from accumulating against the bark, which could cause rot.

Refresh Mulch: Add fresh mulch each spring to keep it effective and to maintain a neat appearance.

8. Propagation

Cryptomeria 'Compressa' can be propagated from semi-ripe cuttings taken in late summer. These should be rooted in a well-draining compost mix. However, like many conifers, this variety is best propagated by professional nurseries to maintain its specific characteristics.

By following these simple care guidelines, your Cryptomeria japonica 'Compressa' will grow into a striking, low-maintenance specimen that adds elegance and texture to your garden throughout the year. Whether planted in containers, as part of a rock garden, or as a sculptural feature in a small garden, this compact Japanese cedar is sure to become a standout plant.

At Lakeside Tree Nursery, we are committed to offering the best selection of healthy, beautiful trees. With proper care, Cryptomeria 'Compressa' will reward you with years of lush foliage and timeless beauty, transforming your outdoor space into a peaceful, green retreat.