Cryptomeria Japonica Bonsai Tree Care Sheet

General Description:

The Cryptomeria Japonica Bonsai Tree is a hearty evergreen that is native to the mountainous regions of Japan, and has the ability to grow up to 100 feet tall in wild! Their natural environment is wet and full of constant moisture, so they prefer to be well-watered. So, if you are “one of those” that tend to overwater you plants, this is the perfect bonsai tree for you! Where most trees would get root rot, this unique tree will actually thrive from soaking roots. This bonsai tree from our wholesale nursery is known for its brownish red bark, that always seems as if it is peeling off and the petite, green and lovely wedge shaped spikes that make up the dense foliage. This particular tree is often compared to a Christmas Tree due to its proportionate growing pattern, and many find it enjoyable to decorate with tiny ornaments during the holidays.


We recommend that you keep the Cryptomeria Japonica Bonsai Tree in either full sun or light shade, which will closely mirror its natural environment. Just remember, that the more light it has, the faster the water will evaporate – which means you will need to water very frequently when it is hot outside! Otherwise, the foliage could begin to turn brown…..


This bonsai is native to cooler temperatures, but you still need to offer protection from the cold during the harsh winter months and any prolonged freezes to keep the roots from freezing (that typically means death for a bonsai!) We recommend that you bring the tree into a garage where minor protection from the cold is available. Be sure to consistently water the tree, even when brought indoors, as a high moisture level is essential to the health of the tree.


As stated multiple times already, you need to water this bonsai often. You should never allow the soil to completely dry out or it could be fatal to the tree. During the winter, you will not need to water as much (because the water will not evaporate as quickly) but still test the soil to make sure there is moisture daily. We also recommend adding a humidity tray to your bonsai to assist in keeping the tree moist.


You should fertilize this bonsai tree with a balanced fertilizer once every two weeks, starting in the spring and continuing through summer. When fall rolls around, you should use a nitrogen free fertilizer.


As an evergreen, you can simply pinch away new and unwanted growth at the base of the shoot to help shape and promote thicker overall foliage for training. If you use scissors, the tips of the foliage will most likely turn brown – so you should use your index finger and thumb to remove anything undesirable. It is recommended that you begin pinching away growth directly near the trunk, so that way the character of the trunk is visible and the tree will appear “older”, which is highly desirable in bonsai. You should pinch away old growth as new growth appears, to help prevent dieback. If you choose to wire, the best time to do so is in the early spring. But BEWARE, because although the branches of the tree are flexible, they also tend to snap without warning if bent to far. This bonsai is well suited for formal and informal upright. Need a refresher on bonsai tree styles?

Potential Pests:

Unfortunately, this particular tree is susceptible to red spider mites and scale. For scale, you can dab rubbing alcohol on the outer edge of the shell, and then scrap away with a sharp knife (be careful not to damage the bark!). Ensure that you thoroughly check the tree for eggs to make sure they are all taken care of. For spider mites, you can mix 1 quart of warm water and 1 tsp of dish soap, and use the solution to thoroughly rinse the tree. Make sure that you complete rinse


You should repot your Cryptomeria Bonsai Tree in the spring, just before growing season starts every 3 to 5 years. As the tree ages and grows, it can be repotted less frequently. You should replace the soil will a highly organic soil with good drainage, since you will be watering so frequently.

Helpful Comments:

You need to provide this bonsai with a humidity tray for constant air moisture. Without proper levels moisture, it will not survive long term.