Cryptomeria Japonica Little Diamond - A Unique Dwarf Conifer Tree

Cryptomeria Japonica Little Diamond Overview

Cryptomeria japonica, also known as Japanese cedar or Sugi in Japan, is a popular evergreen tree with needle-like foliage that grows up to 70 meters tall. However, the Cryptomeria japonica little diamond is a dwarf cultivar of the species that grows only up to 1.5 meters high and 90 centimeters wide. This unique conifer tree has blue-green needles that turn coppery-bronze in winter, making it an attractive ornamental plant for gardens and landscapes.

Growing Conditions

The Cryptomeria japonica little diamond is an easy-to-grow plant that prefers well-drained soil and full sunlight exposure. It can tolerate a range of soil types, including acidic, alkaline, clay, and loamy soils. The tree is hardy in USDA zones 5-9, which means it can withstand temperatures as low as -20 degrees Ceus in winter.

Soil Requirements

While the little diamond is adaptable to various soil types, it thrives best in fertile and well-drained soil. If your soil is heavy clay or poorly drained, consider amending it with organic matter such as compost or peat moss to improve drainage and fertility.

Watering Needs

Young trees require regular watering to establish themselves, especially during the first year after planting. However, once established, the little diamond requires less watering, as it can tolerate drought conditions. Make sure to water deeply but infrequently to encourage deep root growth.

Fertilizer Requirement

You can fertilize your little diamond tree with a balanced slow-release fertilizer in early spring or late fall. Avoid fertilizing in the summer, as this can burn the roots and foliage of the tree.

Pruning and Maintenance

The Cryptomeria japonica little diamond is a low-maintenance tree that requires minimal pruning. However, you can prune the tree to maintain its shape or remove any dead or diseased branches. Prune in late winter or early spring before new growth emerges.

How to Prune

Use sharp and clean pruning tools such as bypass pruners or loppers. Remove no more than one-third of the tree's total foliage or branches each year to avoid stressing the tree. Cut back to a healthy bud or branch junction to encourage new growth.

Pest and Disease Control

While the little diamond is relatively disease-resistant, it can still be affected by some pests and diseases. Common problems include spider mites, scale insects, and needle blight. You can control these issues by applying insecticidal soap or horticultural oil, or by pruning infected branches.

Uses and Benefits

The Cryptomeria japonica little diamond is a versatile plant that can be used for various purposes in gardens and landscapes. Here are some of its uses and benefits:

Hedge Planting

You can use the little diamond tree as a hedge or border plant in your garden. Its dense foliage and compact size make it an ideal plant for creating privacy screens or windbreaks.

Bonsai Cultivation

The little diamond is a popular choice for bonsai cultivation due to its slow growth rate and small size. It can be trained into various shapes and forms, making it a fascinating addition to any bonsai collection.

Ornamental Value

The Cryptomeria japonica little diamond is an attractive ornamental plant that adds beauty and interest to any landscape. Its blue-green needles and winter color change make it a unique and eye-catching plant.

FAQs

1. How do I plant a Cryptomeria japonica little diamond?

To plant a little diamond tree, dig a hole that is slightly wider and deeper than the root ball. Mix some organic matter such as compost or peat moss into the soil, then place the tree in the hole and backfill with soil. Water deeply and mulch around the base of the tree to retain moisture.

2. How often should I water my little diamond tree?

Young trees require regular watering to establish themselves, especially during the first year after planting. However, once established, the little diamond requires less watering, as it can tolerate drought conditions. Make sure to water deeply but infrequently to encourage deep root growth.

3. Can I grow a little diamond tree in a container?

Yes, you can grow a Cryptomeria japonica little diamond in a container, provided that the container is large enough to accommodate the root system. Use a well-draining potting mix and water regularly to prevent the soil from drying out.

4. How fast does a little diamond tree grow?

The Cryptomeria japonica little diamond has a slow growth rate and typically grows only up to 1.5 meters high and 90 centimeters wide in ten years.

5. Is the little diamond tree deer-resistant?

While the little diamond is not entirely deer-resistant, it is more resistant to deer browsing than other conifers due to its dense foliage and small size. However, if you live in an area with high deer pressure, you may need to protect your tree with fencing or deer repellents.


The Cryptomeria japonica little diamond is a unique and versatile plant that adds beauty and interest to any garden or landscape. Its blue-green needles, winter color change, and small size make it an attractive ornamental plant that can be used for various purposes, from hedge planting to bonsai cultivation. With proper care and maintenance, this dwarf conifer tree can thrive for many years in your garden.