Few deciduous trees do as much for a four-season landscape as the Japanese stewartia. You could say spring’s bronzed-leaf emergence, summer’s cup-shaped white flowers, and fall’s stunning foliage change are enough to set this ornamental tree apart from the others. But the Japanese Stewartia has one more beauty secret to reveal, with beautiful, peeling bark that’s stunning year-round. This last feature is especially evident once its leaves have fallen, lending a distinctive focal point to the winter landscape. In this article, I’ll go over Japanese Stewartia’s traits, its preferred growing conditions, and how to care for the tree. If you didn’t know about the Japanese Stewartia before, I’m pretty sure you’ll be planning to add one to your garden before you’re finished reading.

Traits of the Japanese Stewartia

There’s lots to know about this medium-sized, long-lived, winter-hardy tree. The Stewartia genus has a number of species, and while each is a little different, they all share the same flowers that I love to see in early to mid-summer. The Japanese Stewartia (Stewartia pseudocamellia) is a relative to the Camellia, known as the plant that tea comes from, in the Theacea family. You might notice that “false Camellia” is in Japanese Stewartia’s species name.

You can really see the relation in the white Camellia-like flowers with the same showy orange-yellow anthers. I’m not the only one enchanted by the flowers. Bees love them, too, and this tree blooms at an important point in the season, when many plants aren’t flowering.

Japanese Stewartia is a deciduous tree with dark-green leaves through spring and summer. As September comes, its fall foliage becomes its own draw. As the leaves change to a blaze of burgundy, orange-red, yellow, and red-purples, they then fall to reveal the tree’s beautiful bones. The bark—a combination of grays, shades of oranges, and reddish-brown strips—is flaky and peels, but underneath, the tree is smooth and sometimes even luminous. It really offers something for every season.

Hardiness of the Japanese Stewartia

Native to Japan and the Korean peninsula, Japanese Stewartias are temperate-climate trees. They’re hardy in USDA Zones 5a to 8b, meaning they can handle an extreme low of -15 degrees F. Gardeners from coastal Maine to Central Texas can enjoy this beauty in their landscapes.

How tall does a Stewartia tree grow?

Really consider Japanese Stewartia’s size before adding one to your garden plan. Growing from 12 to as tall as 40 feet, it becomes a prominent specimen plant in the long term. The tree grows slowly, taking on a pyramidal-to-oval shape, rounding out to be between 8 and 25 feet in diameter.

The best growing conditions for Japanese Stewartia

In its native range, Japanese Stewartia is typically found in the partial shade of water-rich mountain forests. Here in the US, this means:

• They’re drought intolerant, preferring damp and humid areas.
• They want well-drained sandy loams and humus-rich soils, as found in the mountains of Japan. Clay soils, rocky soils, and dry soils will not do.
• While they aren’t true Camellias, they share their preference for slightly acidic soil, 4.5 to 6.5 pH.

Selecting a site

Japanese Stewartias are difficult to transplant once established, so choose the best spot available to you. Where you plant your Stewartia depends a little on your climate. Consider these factors:

1. The tree can tolerate full sun in cooler climates but will do better with light-to-medium shade to protect from the hot afternoon sun, especially in warmer areas.
2. If you get strong winter winds, give the tree some kind of windbreak.
3. Especially to get established, and even once it is established, this stewartia needs regular watering. Plant the tree where irrigation is convenient so you keep up with this task.

How to plant

With the right location in mind, follow these steps:

1. 1. Dig a hole at least twice as big around as the tree’s root ball. A tree spade a good tool for this job.
   2. Find the root collar on your tree. This is the point on the trunk where the root system starts. Dig the hole so the root collar will sit just at soil level. If you plant too deep, you risk trunk decay; too shallow and the roots will have a harder time getting established.
   3. Remove any packaging materials from the tree. Some people say it’s OK to leave the burlap and cage around balled and burlapped trees, but these will hamper your tree’s establishment and growth.
   4. Gently place the tree in the hole so its stem is vertical. Place bare-root trees so their roots are spread out in the hole. Don’t bend the roots to make them fit. Instead, either dig the hole wider or use pruners to cut off the excess root.

1. Backfill the hole with the soil you removed. Break up clods of soil, and remove large rocks in the process. Lightly pack the soil with your hand or foot as you work. The end result should be level ground around the tree.
2. Water well to settle the soil around the tree roots. Add additional soil where too much settling occurs.
3. Add a natural mulch to shade the soil and retain moisture. Be sure to keep the mulch 2 inches away from the trunk, otherwise fungal issues could set in.

Watering, feeding, and caring for a Japanese Stewartia

Another draw to the Japanese Stewartia is that it’s so low maintenance. It’s not susceptible to foliage fungus or disease. Even the deer don’t bother these trees. They don’t need much from you through the years.

As a slow-growing tree, this Stewartia takes its time in establishing its root system. I think that keeping it watered regularly is a small price to pay for its beauty. Even once it reaches its mature size, your Japanese Stewartia won’t tolerate drought.

There is little to no need for fertilizers. In fact, you want the Stewartia to put its energy into developing a healthy root system, and most fertilizers are focused on above-ground growth.

Pruning Stewartia trees

Stewartias naturally have multiple stems growing from their trunks. Knowing this, it’s gardener’s choice: You can leave the trees unpruned for more of a hedge-like or shrub-like appearance, or you can prune the branches for a cleaner look at the bark-shedding trunk.

When does a Japanese Stewartia flower?

The more sun the tree gets, the more flowers it will produce, generally, but too much heat and sun will stress the tree and have the opposite effect, even causing its leaves to burn. This is why part sun is the better choice.

In June, even before the flower opens, their rounded buds are a lovely feature. Come mid-summer, the flower show takes off. The whole tree will bloom over a period of several weeks, though individual blooms flower and fade quickly.

Additional growing tips

There are two more things you should know:

• Be patient with your tree. Its own unique bark characteristics will develop over time. It can take up to 10 years for the showy bark to come on strong.
• Japanese Stewartias used to be difficult specimens to come by at garden retailers. Today, you can find them online, if you can’t find them at a store near you. They are often more expensive than other flowering-tree options. Because there are a number of Stewartias, including the similar-looking Korean Stewartia, be sure to confirm the species name. Among Japanese Stewartia cultivars, you might look for ‘Pilar Bella’, ‘Cascade’, ‘Milk and Honey’, or ‘Ballet’.
• If you’re lucky enough to have gardener friends with a Japanese Stewartia under cultivation, you can propagate the tree by seeds and cuttings, as well.

Super Stewartia

Whether you’re looking for a showy anchor plant with four-season appeal or a mid-sized, low-maintenance tree to plant alongside your patio, you just might have found it here, with the Japanese Stewartia. As you can tell, I can’t say enough good things about it.

This tree is all about patience: Take your time in choosing the location, because you don’t want to move it. Know that it will take its time in establishing its roots—you’ll have to help it along with regular watering—and in putting on its showy bark display. And fill yourself with anticipation for the flowers that come along after most trees’ blooms have gone. To have these members of the tea family in your landscape is worth the wait.

Discover more amazing trees for your landscape in these articles: 

• Weeping trees
• Weeping blue atlas cedar
• Trees with white flowers
• Fertilizing a Japanese maple
• Trees with peeling bark 
• Dwarf Hinoki cypress