Euonymus Japonicus Care: Tips On Growing The Japanese Euonymus

Botanically known as Euonymus japonicus, the plant type belongs to the spindle tree family Celastraceae (Japanese Spindle Tree ‘Microphyllus’).

Native to Japan, China, and Korea, the Evergreen Euonymus is an evergreen shrub or small tree. The plant has been naturalized in North America and Europe.

Euonymus Japonicus (Japanese Euonymus)Pin

You’ll hear it called by its common names, including Japanese Euonymus and Evergreen Euonymus.

Euonymus japonicus is quite popular among landscapers and gardeners in its native land and is often found in gardens and parks. It is known for its striking oval, glossy leaves and inconspicuous flowers.

Despite having toxic characteristics, Evergreen Euonymus plants are incredibly aesthetic and look perfect when lined alongside a garden bed.

Being tolerant of trimming and being quite hardy, Euonymus japonicus is loved by many gardening enthusiasts.

Euonymus Japonicus Quick Care Tips

  • Botanical Name: Euonymus Japonicus
  • Common Name(s): Japanese Euonymus, Evergreen Euonymus
  • Synonyms: None
  • Pronunciation: yoo-ON-ih-mus, juh-PON-ih-kuh
  • Family & Origin: Celastraceae family, native to Japan, Korea, and China
  • Growability: Easy to grow
  • Grow Zone: USDA zones 6-7
  • Size: Can grow up to 6’ – 26’ feet tall and 6’ feet wide
  • Flowering: Produces greenish-white flowers in late spring to early summer
  • Light: Full sun to partial shade
  • Humidity: High humidity but tolerates average humidity (30 to 60%)
  • Temperature: 53° – 68° degrees Fahrenheit
  • Soil: Well-draining, loamy soil
  • Water: Average watering needs
  • Fertilizer: Fertilize with a multi-purpose organic compost in June and September
  • Pests & Diseases: Can be susceptible to aphids, mealybugs, leaf miners, mites, and caterpillars; diseases like honey fungus, Euonymus scale, fungal leaf spots, crown gall, witches’ broom, stem dieback, and powdery mildew.
  • Propagation: Can be propagated through stem cuttings or seeds
  • Plant Uses: Used as a hedge, border plant, or as specimen plant in a garden or landscape design. Can also be grown in containers.

Euonymus Japonicus Care

Size and Growth

The striking foliage of the Japanese Euonymus plant, although easy to grow and care for, has a medium growth rate.

The species is a hermaphrodite, meaning it contains both male and female organs and is pollinated by insects.

When grown in the right climate and growing conditions, Evergreen Euonymus japonicus grows up to anywhere between 6’ – 26’ feet in height and around 6’ feet in width.

Control the bushy growth by pruning and making a neat hedge around your garden.

Flowering and Fragrance

Japanese Euonymus produces inconspicuous greenish-white flower color and dark green leaves.

Each flower is quite small, just over ¼” inch wide.

The bloom time of Euonymus japonicus is in late spring to early summer and is known to have a vinegary smell.

If you look for them, they are attractive against the foliage.

Come fall, the plant also produces small orangish-pink fruits in late summer or early fall, which are best kept out of children’s reach as they are toxic.

Light and Temperature

Japanese Euonymus plants are hardy to hardiness zone 6 and 7 (USDA zones) and can thrive in full sun and partial shade to heavy shade locations.

But they are best suited for dry, shaded areas.

Moreover, they thrive in sun-dappled conditions with the afternoon shade in hot summer climates.

Even though the plant is tolerant of shade, it might not fruit as well.

As for temperature, Evergreen Euonymus plants hate dry cold winds. They prefer warmer temperatures.

The annual daytime temperature should be between 53° – 68° degrees Fahrenheit (12° C – 20° C) and night temperatures between 39° – 53° degrees Fahrenheit (4° C – 12° C).

Lower temperatures can cause damage to the plant and even lead to it dying, so be careful in winter.

Watering and Feeding

Japanese Euonymus has average watering needs and doesn’t need to be watered too frequently when the temperatures are within its preferred range.

Avoid overwatering the plant, as it can cause root rot.

Well-drained, damp soil is enough for them.

When watering Euonymus japonicus plants, ensure the soil is dry before dousing them.

As a tropical plant, it also prefers high humidity levels or an average humidity level of 30 to 60 percent in the home.

As for feeding, use multi-purpose organic compost in June and September to allow the plant to thrive.

Soil and Transplanting

The Euonymus japonicus plant is suitable for growing in any soil type.

They can grow in sandy, loamy, and even heavy clay soil.

However, Euonymus japonicus does best in dry, well-drained loamy, or well-drained soils in a sunny location.

When it comes to transplanting, easily prick the seedlings from the cold frame and plant them in compost in a pot.

When the plant is tall enough to handle, plant it in its permanent location.

Space them apart, giving enough space for them to spread.

Grooming and Maintenance

Evergreen Euonymus doesn’t have a lot of requirements when it comes to maintaining and grooming.

However, they can have a bushy spread needing to be trimmed from time to time.

Fortunately, they take well to pruning and do well when clipped.

How to Propagate Euonymus Japonicus

Euonymus japonicus are propagated by two methods, including seeds and cuttings.

With seeds, they need at least 3 months of cold stratification to ripen.

Once done, they are best sown as early in the year as possible in a cold frame.

The seeds take up to 18 months to germinate.

When they are large enough to handle, prick the seedlings out of the cold frame, transplant them in pots, and grow them in a greenhouse through their first winter.

Once the last frost has passed, plant the established plants permanently in late spring or early summer.

When propagating with cuttings, use 1.5” inch to almost 3” inch half-ripe wood cuttings taken at the node or ones with a node.

Plant them in a cold frame during July and August.

Also, use mature wood cuttings and plant them in October in a frame.

In both cases, the cuttings are easy to grow and root steadily at any given time of the year, provided they are given appropriate heating.

Evergreen Euonymus Pest or Diseases

Evergreen Euonymus is known to be one of the plants notably resistant to honey fungus.

However, root rot and some fungal diseases are a problem due to overwatering.

Euonymus scale, fungal leaf spots, crown gall, witches’ broom, stem dieback, and powdery mildew are troublesome additional diseases.

As for pests, the Evergreen Euonymus plant is susceptible to aphids, mealybugs, leaf miner, mites, and attacks from caterpillars, especially during the flowering season.

This evergreen shrub is also a natural host of the sugar beet fly.

Known Hazards:

If you didn’t know, the Evergreen Japanese Euonymus species is known to have toxic parts.

While parts like leaves, fruits, and flowers are a problem, the seeds contain the most amount of toxins.

When consumed in large quantities by animals or humans, it can trigger bouts of vomiting and diarrhea.

It can cause other symptoms like weakness, chills, and convulsions, and can put someone in a coma.

It’s important you be very cautious when planting Evergreen Euonymus in your home, especially if you have children or plants.

Suggested Evergreen Euonymus Japonicus Uses

Despite having some toxic characteristics, box leaf Euonymus plants are used for multiple purposes.

For instance, they are frequently grown as excellent hedge plants in both public and private gardens.

The evergreen spindle is also often used as landscape plants, ornamental plants, topiary, and other garden designs.

Besides agroforestry, Evergreen Euonymus is also used for medicinal purposes.

The bark supposedly has antirheumatic, diuretic, and tonic qualities, and the leaves are used to ease difficult deliveries.

The roots and stems of the plant are also known to yield up to 7 percent gutta-percha, which is a non-elastic rubber used as an electrical insulator.

The same material is also used to make certain plastics.

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