Kwanzan cherry is a flowering cherry cultivar. Developed in the Edo period (1603-1868) of Japan, the Kwanzan cherry isn’t a single species but a cultivar. It’s believed to be the result of multiple interspecific hybridizations involving the Oshima cherry (Prunus serrulata). The original name of the tree is ‘Sekiyama,’ but it is rarely used. Sekiyama is a mountain in Japan.
Kwanzan is scientifically referred to as Prunus serrulata ‘Kwanzan’. The Kwanzan cherry tree was introduced to the United States in 1903 and became a significant part of the National Cherry Blossom Festival in Washington, D.C., where it was planted along the Potomac River from the Lincoln Memorial all the way to East Potomac Park. The original trees were a gift from Japan, specifically from Tokyo Mayor Yukio Ozaki, as a symbol of friendship between Japan and the United States. This gift included 3,000 cherry trees, which were planted in various locations around the city, including the White House grounds.
It is a deciduous tree that grows to between 1 and 9 metres high with an 8-metre spread. Young trees have a vase-shaped habit that becomes more spreading into maturity. In winter they produce red buds, opening to 5-centimetre (2 in) diameter deep-pink double flowers. The trees, which are usually propagated by chip budding or grafting, prefer a well-drained location in full sun.
‘Kanzan’ is the most popular Japanese cherry tree cultivar for cherry blossom viewing in Europe and North America. Compared with Yoshino cherry, a representative Japanese cultivar, it is popular because it grows well even in cold regions, is small and easy to plant in the garden, and has large flowers and deep pink petals. In the city of Bonn, Germany, there is a row of cherry trees where 300 ‘kanzan’ trees were planted in the late 1980s. In Western countries, ‘Pink Perfection’ and ‘Royal Burgundy’ originating from Kanzan have been created.
Characteristics of Kwanzan Cherry
- They are a popular symbol of spring in Japan.
- They have a lifespan of 15-30 years under normal conditions.
- ‘Kanzan’ has pink petals, which are thought to have unexpectedly inherited the characteristics of the white Oshima cherry.
- The trees have an upright-spreading form and can grow up to 25 feet tall.
- The trees have an attractive vase-shaped crown, which can spread 15 to 25 feet wide.
- These trees have a moderate growth rate of 12-24 inches per year.
- The leaves are ovate to elliptic leaves with serrated margins. The leaves emerge bronze or coppery in spring, mature to a glossy dark green in summer, and turn yellow-orange to bronze in fall before dropping.
- The flowers are double-petaled and pink in color, and they appear in clusters in early to mid-spring before the leaves emerge.
- The bark is smooth and shiny when young, turning to a dark gray with horizontal lenticels as it matures.
- Trees have a shallow root system, which can sometimes be invasive and compete with nearby plants for nutrients and water.
- Produce small black fruits (cherries) after flowering, these fruits are typically ornamental and not cultivated for consumption.
- The leaves, stems, and seeds of cherry trees are toxic to pets and humans.
- These trees are suitable for growing in USDA Hardiness Zones 5 to 9.
- Prefer full sun exposure to thrive and produce abundant flowers.
- Kwanzan Cherry trees prefer well-draining, slightly acidic to neutral soil. They can tolerate loamy, sandy, or clay soils, as long as they are not waterlogged.
- While generally resilient, they can be susceptible to certain diseases and pests, including fungal infections such as cherry leaf spot and powdery mildew, as well as pests like aphids and caterpillars.
- These trees are cold hardy to temperatures as low as -10 degrees Fahrenheit.
- Other than landscaping use. They are used in traditional Japanese flower arranging (ikebana).
Variations or hybrids related to Kwanzan Cherry
| Name | Similarities to Kwanzan | Differences from Kwanzan |
|---|---|---|
| Shirofugen Cherry (Prunus serrulata ‘Shirofugen’) | Double white flowers | Weeping growth habit (drooping branches) |
| Akebono Cherry (Prunus serrulata ‘Akebono’) | Double pink flowers | Deeper rose-pink color with a white center |
| Ukon Cherry (Prunus serrulata ‘Ukon’) | Double flowers | Lighter, more pale pink blossoms |
| Kanzan Weeping Cherry (Prunus serrulata ‘Kanzan Weeping’) | Double pink flowers | Weeping growth habit (drooping branches) |
Kwanzan Cherry tree vs Cherry Blossom
The Kwanzan cherry and the cherry blossom are not entirely separate things — the Kwanzan is in fact one of the most celebrated varieties of ornamental cherry blossom tree. Cherry blossom is the broader collective term for the flowering cherries of the genus Prunus, encompassing hundreds of species and cultivars grown across Japan, Korea, China, and now the entire temperate world. The Kwanzan, known in Japan as Kanzan, is simply one particularly magnificent member of that vast flowering family, distinguished by specific characteristics that set it apart from its many relatives.
What makes the Kwanzan immediately recognisable is the extraordinary fullness of its flowers. Where many cherry blossom varieties produce single or semi-double blooms with five petals, the Kwanzan bears densely double flowers packed with up to thirty petals each, creating pompom-like clusters of the deepest, most saturated pink in the entire cherry blossom world. This opulence gives the tree a lushness that other varieties, however beautiful, rarely match. The flowers appear in mid to late spring, slightly later than many other cherries, and hang in pendulous clusters that weigh the branches into graceful arching forms.
In terms of character and cultural resonance, the two occupy rather different spaces. Cherry blossom in its broader sense — and particularly as celebrated in Japanese hanami culture — carries a philosophical weight around the fleeting, ephemeral nature of beauty, with the pale single blooms of the Yoshino cherry being the most iconic expression of that idea. The Kwanzan, by contrast, is more of a statement tree, prized in street planting and formal landscapes for its bold colour, reliable performance, and striking autumn foliage that turns from green to rich copper and orange before the leaves fall.
For the gardener choosing between a Kwanzan and another cherry blossom variety, the decision comes down largely to what kind of beauty is desired. Those drawn to delicacy, fragrance, and the quiet poetry of pale petals drifting in the breeze may prefer the Yoshino or the Shirofugen. Those who want drama, density, and a tree that commands the eye from a considerable distance will find the Kwanzan deeply satisfying. Both belong to the same magnificent tradition of ornamental cherry growing, but they express that tradition in fascinatingly different ways.
Cultivation of Kwanzan Cherry Trees
- Choose a site with full sun — at least six hours of direct sunlight daily — and well-drained, slightly acidic soil. Kwanzan cherry trees struggle in waterlogged or compacted ground, so avoid low-lying areas where water tends to pool after rain.
- Choose a site with full sun — at least six hours of direct sunlight daily — and well-drained, slightly acidic soil. Kwanzan cherry trees struggle in waterlogged or compacted ground, so avoid low-lying areas where water tends to pool after rain.
- Apply a balanced, slow-release fertiliser in early spring just as new growth begins. Avoid over-fertilising with high-nitrogen feeds, as this encourages excessive leafy growth at the expense of flowering and can make the tree more vulnerable to disease.
- Prune sparingly and only when necessary, as Kwanzan cherries are susceptible to disease entering through cuts. The best time to prune is immediately after flowering in late spring, removing crossing, damaged, or dead branches cleanly with sterilised tools.
- Apply a generous layer of organic mulch around the base of the tree, keeping it clear of the trunk itself. Mulching retains soil moisture, regulates root temperature, suppresses competing weeds, and gradually improves soil structure as it breaks down over time.
- Watch for common issues including aphids, caterpillars, silver leaf disease, and bacterial canker. Keeping the tree in good health through proper watering and feeding is the best defence, and any diseased wood should be removed and disposed of promptly rather than left on the ground.
- Kwanzan cherry trees are hardy and generally require no special winter protection in temperate climates. However, late spring frosts can damage emerging flower buds, so be mindful of planting in frost pockets where cold air settles on still, clear nights.
- Kwanzan cherries are relatively short-lived trees compared to many garden specimens, typically performing at their best for fifteen to twenty-five years. Regular attentive care, good drainage, and avoiding unnecessary wounding of the bark will go the longest way toward maximising their healthy lifespan.
Varieties of Kwanzan Cherry Trees
Prunus serrulata ‘Kwanzan’ (Kanzan / Sekiyama)
The original Kwanzan is a small, deciduous tree that grows up to 36 feet tall, with stiffly ascending branches and a vase-shaped habit in youth that becomes more rounded and spreading with maturity. It blooms with abundant clusters of double pink flowers in spring and is considered one of the showiest of all Japanese cherries. Each flower is packed with 24–28 petals, forming full 2-inch pompoms in deep pink, while bronze-maroon foliage emerges alongside the blossoms and matures to glossy dark green through summer before turning yellow-orange and bronze in fall.
Prunus ‘Royal Burgundy’
Royal Burgundy is a slightly slower-growing, smaller sport of ‘Kanzan’ discovered by Frank Parks of Speer & Sons Nursery in Woodburn, Oregon, and released commercially in 1990. With darkish pink double flowers and purple leaves that turn red in fall, it offers a striking replacement for flowering plum. Its flowers are similar to ‘Kanzan’ but slightly darker pink, and the foliage remains a rich purplish tone throughout the season.
Prunus ‘Pink Perfection’
‘Pink Perfection’ is a smaller, compact version of Kanzan created in Britain in the 1930s, with similarly vibrant double blossoms. It is prized in gardens where space is more limited but a bold floral display is still desired. The flowers are a soft, rosy pink — somewhat lighter than the deep pink of ‘Kwanzan’ — and the tree retains the same ornamental appeal that makes the Kanzan family so beloved across Europe and North America.
Prunus serrulata ‘Mount Fuji’
‘Mount Fuji’ grows 15–20 feet tall by 20–25 feet wide and opens earlier in spring than ‘Kanzan’, with slightly pink-tinged buds that turn into white, mildly fragrant, semi-double flowers that hang in pendulous clusters. It has a gracefully spreading crown and is one of the two oldest and most continuously top-selling flowering cherry cultivars alongside ‘Kwanzan’, dating back to at least the 1800s.
Prunus serrulata ‘Shirofugen’ (Shiro-fugen)
‘Shirofugen’ grows 25–30 feet tall and wide and has pink buds that open to fragrant, large white, pink-tinged double blooms that hang on long pedicels in clusters, then age to a deeper pink. The leaves on the vase-shaped, flat-topped tree emerge crimson-bronze, turn green in summer, and take on bronze-red tones in fall. It is noted for its superior disease resistance compared to many other cultivars and is considered spectacular, though its broad spread can be overwhelming in smaller yards.
Prunus serrulata ‘Shogetsu’
‘Shogetsu’ produces large, pure white flowers that are pink in the bud stage. It is a graceful, spreading tree that blooms in late spring, making it one of the last of the ornamental cherries to flower. Its soft, elegant white blossoms and gently arching branches give it a more delicate character than the bold, deeply pigmented blooms of ‘Kwanzan’, making it well suited to quieter, woodland-style garden settings.
Prunus serrulata ‘Ukon’
‘Ukon’ has young leaves of pale bronze, and its flowers are semi-double, large, and yellowish-white to light green with a pink center. This rare and distinctive coloring sets it apart from virtually all other ornamental cherries. Developed during the Edo period, ‘Ukon’ has been granted the Award of Garden Merit and is prized by collectors for its unusual, almost ethereal pale-green blooms that stand in striking contrast to the bronze spring foliage.
Prunus serrulata ‘Amanogawa’
‘Amanogawa’ has a narrow, upright growth habit and produces pale pink flowers, reaching about 15 feet in height. Its columnar form makes it one of the most space-efficient of the Japanese flowering cherries, ideal for tight urban gardens, narrow driveways, or as a vertical accent in mixed borders. The semi-double, lightly fragrant blossoms appear in mid-spring, and the tree puts on a reliable show of warm autumn color before the leaves drop.
Pros and Cons of Growing Kwanzan Cherry Trees
Pros
- Its showy flowers that bloom in the spring, create a stunning display against the sky.
- The tree provides a good amount of shade during the summer due to its broad canopy.
- These trees are not particularly fussy and require full sun and well-drained soil to thrive. They are also tolerant of a variety of soil conditions.
- Kwanzan cherry trees are fast-growing, reaching up to 25 feet tall in a medium growth rate.
- In the fall, the leaves of Kwanzan cherry trees turn a bright yellow-orange, adding another season of interest.
Cons
- These trees have a lifespan of about 15 to 25 years, which is relatively short compared to other trees.
- These trees are susceptible to common cherry tree issues like fireblight, root rot, powdery mildew, and leaf curl.
- Kwanzan cherry trees require regular watering to keep the soil evenly moist.
- The roots of Kwanzan cherry trees are moderately aggressive and grow near to the surface, which may compete with grass and other plants for nutrients and space.
- These trees do not produce edible fruits, which may be a disadvantage for those looking for a tree that offers both ornamental value and edible fruits.