Japanese meadowsweet (Spiraea japonica)

Also known as: Japanese Spirea, Japanese Meadowsweet

Japanese meadowsweet can become problematic due to its rapid spread, forming dense thickets that can overshadow native vegetation. Originally from Japan, Korea, and China, it was brought to other regions for its appealing flowers. It's crucial to manage it carefully to prevent it from becoming invasive and disrupting local plant communities.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting

Attributes of Japanese meadowsweet

Lifespan

Perennial

Plant Type

Shrub

Plant Height

1 m to 1.5 m

Spread

1.5 m to 2 m

Leaf Color

Green Yellow

Flower Size

4 mm to 7 mm

Flower Color

Pink White Red

Images of Japanese meadowsweet

Quickly Identify Japanese meadowsweet

Dense mound-shaped growth up to 6 feet (1.8 meters) in height and spread.

Oval leaves with sharp-toothed margins, transitioning from green to bronze.

Small deep pink flowers in terminal corymbs up to 8 inches (20 cm).

Distinctive elongated follicle fruits, ripening to brown, in small clusters.

Wiry brown stems with thin, hairy branches, around 1/8 inch (0.3 cm) in diameter.

Scientific Classification of Japanese meadowsweet

Phylum

Vascular plants

Class

Dicotyledons

Order

Roses, elms, figs, and allies

Family

Rose

Genus

Spirea

Species

Japanese meadowsweet

Planting and Growing of Japanese meadowsweet

Care Difficulty

Easy

Watering Schedule

Every 8 days

Sunlight Requirements

Full sun

Sunshine Duration

6-10 hours

Ideal Temperature

65-75℉

Soil Type

Potting Mix, Peat Mix

Soil pH

6-7.5

Fertilizer Type

Balanced

Pruning Season

Spring, Summer

Pruning Area

Branches, Leaves

Pruning Frequency

2 times a year

Repotting Season

Spring

Pot Type

Terracotta, Plastic

How to Water Japanese meadowsweet?

For Spiraea japonica, it's important to water until the soil is moist but not soggy. Approximately 500 milliliters per watering session is a good rule to follow, ensuring that the root zone receives adequate moisture without waterlogging the plant.

What are the symptoms of an underwatered Japanese meadowsweet? ›

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More About Watering Techniques→

What Are the Sunlight Requirements for Japanese meadowsweet?

Sunlight Requirements: Full sun, Partial sun

Duration of light: 6 to 8 hours

Spiraea japonica ideally enjoys full to partial sun exposure. Proper light enhances its flowering potential and overall health, promoting vibrant growth and pest resistance.

What is the ideal lighting requirement for Spiraea japonica? ›

How can I ensure Spiraea japonica receives its ideal lighting conditions? ›

What are the benefits of Spiraea japonica receiving ideal lighting conditions? ›

More About Sunlight Requirements Techniques→

What Is the Ideal Temperature Range for Japanese meadowsweet?

Ideal Temperature: 65 ~ 75℉

The ideal temperature range for Spiraea japonica lies between 65°F and 75°F. This range provides the optimal conditions for photosynthesis and other metabolic activities that support healthy growth and flowering. Temperatures within this range facilitate proper development without causing stress to the plant.

What Soil is Best for Japanese meadowsweet?

Soil type: Loam, Sandy loam

Soil PH: 6 ~ 7.5

Spiraea japonica thrives in nutrient-rich soils that provide essential minerals for its growth. The presence of organic matter in loam or sandy loam enhances fertility and supports healthy root development, leading to vibrant blooms. Proper drainage is crucial for Spiraea japonica to avoid root rot and other water-related issues. Sandy loam facilitates excess water drainage while retaining some moisture to sustain plant hydration, optimizing growth and overall vigor. Consistent soil moisture without waterlogging is ideal. This balance ensures that Spiraea japonica receives adequate hydration, crucial for nutrient absorption and photosynthesis, without the detrimental effects of standing water. More About Soil→

How to Fertilize Japanese meadowsweet?

Fertilizer type: Balanced

For Spiraea japonica, it is important to use a balanced fertilizer with an N-P-K ratio around 10-10-10. When using liquid fertilizer, a dilution of approximately 1 tablespoon per gallon of water is recommended. For slow-release fertilizers, apply about 1 pound per 100 square feet. These amounts ensure robust growth without risking nutrient burn. More About Fertilizing Techniques→

How to Prune Japanese meadowsweet?

Pruning Time: Spring, Summer, Autumn

Start by removing any dead or damaged wood, which will help improve air circulation within the plant. Next, cut back old flower heads to promote a second flush of blooms. Trim the branches back by about one-third to encourage denser bushiness. Always use sharp, clean tools to make precise cuts just above a healthy bud. More About Pruning Techniques→

How to Propagate Japanese meadowsweet plant?

Propagate Time: Spring,Early spring,Late spring

Harvest seed pods from mature Spiraea japonica plants in late spring. Ensure the pods are dry and fully developed to maximize germination rates when you plant the seeds.

Choose healthy, semi-hardwood stems for cuttings in early spring. Cut just below a node with sharp shears, then remove leaves from the lower half to prepare them for rooting.

In spring, carefully dig up mature Spiraea japonica plants and divide sections using a sharp spade. Each division should have roots and stems to ensure successful transplantation.

More About Propagating Techniques→

How to Repot Japanese meadowsweet plant?

Repotting frequency: Every 2-3 years

Spiraea japonica should be repotted when you notice its growth slowing down or when roots begin protruding from the drainage holes. This often indicates that the plant has outgrown its current container. Spring and autumn are optimal times for repotting, allowing the plant to establish itself before extreme temperatures.

Select a pot that is slightly larger than the current one, ideally about 2 inches wider. Ensure it has good drainage holes to prevent waterlogging, which could harm the roots. A ceramic or clay pot is preferable as it can help regulate soil moisture. The right pot can improve air circulation to the roots and promote healthy growth.

A well-draining loam mix is essential for Spiraea japonica. This type of soil keeps the roots from sitting in water, reducing the risk of root rot. The addition of organic matter can enhance soil fertility, providing essential nutrients that encourage healthy and vibrant foliage.