Construction work is carried out carefully to avoid damaging the ginkgo tree roots.
01Clearing of hedera and undergrowth
Over the upper layer of the ginkgo tree root system, there is an extremely vigorous growth of hedera. We thoroughly removed this layer of undergrowth, while taking care not to damage any roots, in order to remove the stress on the trees that comes from having to compete for water.
02Using water injection to improve soil
Soil survey results have indicated that some of the soil around the trees is in a compacted state. To mitigate this and realize an environment that makes it easier for the ginkgo tree roots to grow, we used water injection to soften the hardened areas, which improved soil quality while avoiding damage to the roots as much as possible.
03Laying rice straw mulch
We laid a layer of rice straw mulch on the ground to prevent the soil from drying out, particularly in summer, and to keep it warm in fall and winter.
04Installing an irrigation system
We have installed an irrigation system that can provide regular watering automatically in order to ensure the ginkgo tree root system has sufficient water.
05Removing the roadbed of a former road
The roadbed of a former road, which was laid before the current tennis courts were constructed, divides and obstructs the growth of the root system. Therefore, we carefully removed it in a way that does not damage the ginkgo roots and replaced it with good quality soil.
06Installing wood decking in the shops lining the road passing through the ginkgo tree rows
We removed the interlocking blocks used as flooring for the shop terraces and then carried out water injection to improve soil quality and realize a better environment for the ginkgo tree root system. To prevent it from drying out, we laid rice straw mulch and installed an irrigation system. Above this, we installed raised wooden decking as a way of avoiding stress on the root system from pedestrian foot pressure.
01Using water injection to improve soil
Using the same process as the measures in 2024, we have continued to use water injection to soften the hardened areas, which has improved soil quality while avoiding damage to the roots as much as possible. This has realized an environment that makes it easier for the ginkgo tree roots to grow.
02Repairing rice straw mulch
We repaired the layer of rice straw mulch that was laid through the measures in 2024 in places where it had been disturbed by the passage of time or the water injection process outlined in 01.
03Inspecting the irrigation system
We inspected the irrigation system and hose network installed through the previous measures and confirmed there were no problems.
01Measuring trunk circumference
In April 2024, we installed dendrometers on eight of the ginkgo trees. Dendrometers are devices for measuring trunk circumference and as the condition of the tree is most noticeable in the trunk, dendrometers can be used to monitor the growth of the ginkgo trees and check if the remedial measures are having an effect. Installing dendrometers has no negative effects on the trees.
02Measuring soil moisture content
We are regularly measuring the moisture content of soil near the westernmost row of ginkgo trees. Through these measurements, we can monitor whether the soil is too wet, appropriately moist, or too dry, as well as whether the timing between watering and the amount of water being used is correct.
Preserving the Four Rows of Ginkgo Trees and the iconic view of the Gallery seen in from the trees for the benefits of future generations.
With new rows of trees to be planted in line at the symbolic 2.5-ha square in front of the Gallery, a new plaza will be developed.
Developing a central plaza between the baseball stadium-- which is annexed with a hotel—and the rugby stadium, thus contributing to an increase in open spaces.
Transplanting existing trees and planting new trees in the neighboring area will create a new woodland that will pair with the wooded area surrounding the iconic hackberry tree, “Gokambei Enoki.”
Developing a path that is rich with green and will run through the district north to south (to be completed in 2028 or later), thus helping people move around with relative ease in the district.
Our efforts to encourage involvement in creating and enjoying the new greenery of Jingu Gaien District include plans to hold events enlisting community involvement as well as implementation of the Reiwa Tree Donation Program, which involves collecting donations from the public for the development of new green spaces.
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About the event
About the Reiwa Tree Donation Program
Refer to the Documents List page of the website for further information and data.