A Viburnum that puts on a show for much of the year, Viburnum plicatum ‘Summer Snowflake’ is a spring-flowering deciduous shrub prized for its elegant, tiered form and repeat blooms.
Large lacecap-style flowers appear in clusters along the horizontal branches in spring, creating a striking layered effect. Unlike many other varieties, this one is known for its ability to flower again later in the season.
Features and Seasonal Interest
In summer, given adequate moisture, Viburnum plicatum ‘Summer Snowflake’ produces a second flush of flowers that can continue well into the warmer months.
As the flowering season winds down, the plant begins its transition into autumn, when the foliage takes on rich tones of purple to red before leaf fall in winter.
Following the flowers, small berries develop. These start red and gradually turn black, providing a valuable food source for birds and adding further seasonal interest.
How to Encourage Repeat Flowering
To promote a strong second flush of blooms, maintaining consistent soil moisture is essential.
Apply a deep layer of mulch around the plant, extending out to the drip line while keeping it clear of the trunk. This helps retain moisture and keeps the root system cool, both of which support continued flowering through summer.
Growing Conditions
For best results, plant in a position with part shade. In warmer climates, additional protection from harsh afternoon sun will improve performance.
Prepare the soil well before planting by incorporating organic matter such as compost, leaf mould, and well-rotted manure. This helps create the humus-rich conditions that Viburnums prefer.
Water in thoroughly after planting and maintain a consistent watering schedule during establishment.
Soil and Mulching
A deep mulch layer—around 25 cm (10 inches)—is recommended. This not only conserves moisture but also gradually improves soil structure and fertility as it breaks down.
Once established, the plant will benefit from the ongoing nutrient supply provided by the mulch.
Pruning Viburnum plicatum ‘Summer Snowflake’
This is a shrub that is best left unpruned so its natural, tiered growth habit can be fully appreciated.
If pruning is necessary, carry it out immediately after flowering to avoid removing next season’s buds.
Mature Size and Growth Rate
This shrub typically grows to a medium size with a broad, spreading habit. Its layered branching structure becomes more pronounced with age, making it an excellent choice as a feature plant.
Landscape Uses
Ideal for use as a focal point, in mixed shrub borders, or as part of a woodland-style garden. Its horizontal branching also makes it effective when planted where it where it has the space to grow as more of a specimen tree can be viewed from all sides.
Common Problems
Poor flowering is usually linked to dry conditions or excessive heat. Improving soil moisture and adding mulch will often resolve this.
