Japanese Black Pine 20/40cm (P9T)

Japanese Black Pine Pinus thunbergii originates from the coastal regions of Japan, including Kyūshū, Shikoku and Honshū, as well as South Korea. This evergreen conifer typically grows to 12-20 metres tall, though it can reach heights of 40 metres in ideal conditions. The tree features distinctive black, scaly bark and needles arranged in pairs, which is typical of pine species.

This hardy pine thrives in full sun with well-draining soil conditions. It adapts well to various soil types – sandy, loamy, or clay – provided drainage is adequate.

The Japanese Black Pine develops a characteristically rugged, windswept look in nature. Its excellent tolerance to pollution and salt spray makes it perfect for difficult growing conditions in urban areas and coastal sites. This species is particularly prized for bonsai work and ranks among the most sought-after trees for this ancient art.

The traditional Japanese niwaki pruning technique works beautifully with this pine, creating that coveted mature, weathered appearance. As the tree ages, its bark naturally develops a rough, textured surface that adds to the impression of an ancient miniature specimen. The needles respond exceptionally well to trimming and can be reduced in size, helping maintain proper scale in bonsai cultivation.

Japanese Black Pine proves remarkably versatile – whilst it excels in the precise art of bonsai, it also serves as a tough and appealing choice for outdoor gardens.

A simple guide to caring for a Pinus thunbergii, or Japanese black pine, in the UK;

Location
The Japanese black pine prefers a location with full sun exposure. It’s also relatively wind-tolerant, so it can withstand more exposed locations.

Soil
This tree is adaptable to a range of soil types, including sandy, loamy, and clay, as long as they provide good drainage. It can also tolerate various pH levels, from acidic to alkaline.

Watering
While the Japanese black pine is drought-tolerant once established, you should ensure it receives regular watering until it is well established, especially during dry periods. Avoid waterlogging the soil, as this can lead to root diseases.

Pruning
Pinus thunbergii doesn’t generally require heavy pruning, but you can trim it to maintain a specific size or shape if desired. Do this in late winter or early spring, before the onset of new growth.

Feeding
If your soil is poor, a slow-release, balanced fertiliser applied in the spring can help support the tree’s growth. Generally, however, these trees are not heavy feeders and may not need additional fertilisation if your soil is already rich.

Pests and Diseases
Keep an eye out for pests like sawflies, caterpillars, and borers, as well as diseases like needle blight and root rot.

Ultimate height
Higher than 12 metres

Time to ultimate height
20–50 years

Ultimate spread
4–8 metres

Promoting Deep Root Development with our unique tall 9cm pots.
Our tall 9cm pots are a smart strategy for cultivating trees with strong and deep root systems. This leads to healthier and more resilient trees that are better prepared for transplantation and long-term growth in your garden.

• Enhanced Root Growth
• Reduced Root Circling
• Improved Stability
• Better Soil Temperature Regulation
• Reduced Transplant Shock

🇬🇧 UK grown by ourselves at our nursery – Generally supplied approx 20/40cm tall in deep 9cm pots.