Snowmound Spirea Spiraea nipponica 'Snowmound'

👤 Non-toxic to humans
🐾 Non-toxic to pets
🌸 Blooming
🍪 Not edible
‍🌱 Easy-care
Tosa spirea 'Snowmound'


Snowmound is an ornamental shrub that boasts a wealth of small white flowers, which create an appearance reminiscent of a mound of snow resting atop its branches. The foliage of the Snowmound is a vibrant green, providing a stunning contrast against the pure white flowers. This deciduous shrub presents its leaves in a classic oval shape with a pointed tip and serrated edges. Each leaf is attached to brown stems that provide sturdy support for the profuse floral display. The clustered flowers are small, with multiple rounded petals, and they grow in dense, showy clusters that envelope the branches in late spring to early summer. Overall, the Snowmound is celebrated for its lush, arching branches and the cascading effect of its white blooms, creating a picturesque display in any garden landscape.

Plant Info
Common Problems

About this plant

  • memoNames

    • Family


    • Synonyms

      Snowmound Spirea, Nippon Spirea

    • Common names

      Spiraea nipponica 'Snowmound'.

  • skullToxicity

    • To humans

      Spiraea nipponica 'Snowmound', commonly known as Snowmound Spirea, is not considered dangerously toxic to humans. There are no well-documented cases of poisoning or serious toxicity arising from ingesting parts of this plant. However, as a precautionary measure, it is advisable not to consume any part of ornamental plants. In rare cases, if ingested, it may cause mild stomach upset. If you suspect poisoning from this plant, seek medical advice.

    • To pets

      Snowmound Spirea is generally not known to be toxic to pets. If a pet ingests a small amount of this plant, it is unlikely to cause more than mild gastrointestinal upset, such as vomiting or diarrhea. If your pet consumes large amounts or shows severe symptoms, it is best to consult a veterinarian.

  • infoCharacteristics

    • Life cycle


    • Foliage type


    • Color of leaves


    • Flower color


    • Height

      4-5 feet (1.2-1.5 meters)

    • Spread

      4-5 feet (1.2-1.5 meters)

    • Plant type


    • Hardiness zones


    • Native area



  • money-bagGeneral Benefits

    • Ornamental Value: Snowmound spirea has cascading branches of white flowers in spring, adding aesthetic appeal to garden landscapes.
    • Low Maintenance: This plant is easy to care for, requiring minimal attention once established, making it suitable for novice gardeners.
    • Drought Tolerance: Once established, it can withstand periods of dry conditions, reducing the need for frequent watering.
    • Pest Resistance: It is generally resistant to pests, lessening the need for chemical treatments.
    • Disease Resistance: Snowmound spirea is resistant to many common plant diseases, ensuring a healthy plant with less maintenance.
    • Hardiness: It can thrive in a range of climatic conditions and is hardy in USDA zones 3 through 8, making it suitable for many gardens.
    • Attracts Wildlife: The flowers attract bees, butterflies, and other pollinating insects, supporting biodiversity.
    • Seasonal Interest: Provides visual interest in the garden throughout multiple seasons with its flowers in spring and foliage in fall.
    • Versatility: Suitable for a variety of garden uses, including borders, hedges, and as a standalone specimen.
    • Fast Growth: Exhibits fast growth rate, allowing for quick establishment and landscape impact.

  • medicalMedical Properties

    This plant is not used for medical purposes.

  • windAir-purifying Qualities

    This plant is not specifically known for air purifying qualities.

  • leavesOther Uses

    • Photography Backdrops: Snowmound's profuse white blooms create a stunning background for springtime garden photography.
    • Wedding Decor: Branches of Snowmound can be used in floral arrangements or as part of a natural wedding arch during the blooming season.
    • Educational Tool: Snowmound can be used in schools or educational programs to teach children about plant life cycles and pollination.
    • Landscape Design Teaching: Landscape architecture students can use Snowmound to practice design techniques due to its distinct shape and seasonal changes.
    • Artistic Inspiration: The plant's aesthetic appeal provides a visual muse for painters and illustrators dedicated to botanical subjects.
    • Thematic Gardening: Snowmound can be included in "white gardens" where flowers of a single color are featured for a striking visual impact.
    • Culinary Presentation: Although not edible, the flowers can be used as a non-toxic decorative element for plating high-end dishes.
    • Bonsai Practice: With proper technique, Snowmound could potentially be grown as a bonsai for enthusiasts looking to work with a less traditional species.
    • Nature Crafting: Dried branches can be used in creating homemade wreaths, garlands, or other rustic craft projects.
    • Photographic Reference: The plant can provide a natural size reference in landscape photography due to its well-known growth habits.

Interesting Facts

  • bedFeng Shui

    The Snowmound Spiraea is not used in Feng Shui practice.

  • aquariusZodiac Sign Compitability

    The Snowmound Spiraea is not used in astrology practice.

  • spiralPlant Symbolism

    • Purity: The 'Snowmound' Spiraea, with its small, white flowers that cover the shrub like a mound of snow, can symbolize purity and innocence, much like the unblemished quality of freshly fallen snow.
    • Celebration: This plant often blooms in late spring, a time commonly associated with renewal and joy, making it a symbol of celebration especially during significant events that coincide with springtime.
    • Transformation: Spiraea's growth from a bare plant to a mound of white blossoms represents transformation and the beauty of change, paralleling life's ability to transform itself seasonally.
    • Adaptability: As a hardy plant that can thrive in various conditions, Spiraea 'Snowmound' embodies resilience and the capacity to adapt to life's circumstances.
    • Elegance: The graceful arching branches of the Spiraea 'Snowmound' suggest elegance and refined beauty, making it a symbol of sophistication and understated charm.

Every 1-2 weeks
10000 - 20000 Lux
Not applicable
Late winter
Annually after flowering
  • water dropWater

    Snowmound Spirea prefers regular watering, especially during dry spells. Ensure the soil remains evenly moist without being waterlogged. Water the plant deeply once a week, providing about 1 gallon of water per session for established shrubs. Increase the frequency during periods of intense heat or drought to twice a week. Always check the soil moisture level before watering; the top inch should be dry to the touch before you water again.

  • sunLight

    Snowmound Spirea thrives in full sun to partial shade. Ideally, plant it in a location where it receives at least six hours of direct sunlight per day. While it can tolerate some shade, the blooms may not be as prolific or vibrant. A spot with morning sun and afternoon shade can be particularly beneficial in regions with very hot summers.

  • thermometerTemperature

    Snowmound Spirea is hardy and can tolerate a wide range of temperatures. It grows well in temperatures as low as -20 degrees Fahrenheit and as high as 90 degrees Fahrenheit. However, the ideal growing conditions are between 60 and 75 degrees Fahrenheit. Ensure it's planted in an area where it can be shielded from harsh winter winds for better cold tolerance.

  • scissorsPruning

    Prune Snowmound Spirea immediately after flowering to shape the bush and to encourage more blooms for the next season as it flowers on old wood. Cut back the stems that have flowered by about one-third to one-half. To maintain plant health and vigor, periodically thin out older stems. Pruning annually or biennially is typically sufficient for this plant.

  • broomCleaning

    As needed

  • bambooSoil

    Snowmound Spirea thrives in well-draining soil that is rich in organic matter, with a preferable soil pH range of 6.0 to 7.0. The best soil mix for this plant would consist of garden soil, compost, and peat or leaf mold. Additionally, incorporating a slow-release fertilizer into the mix can provide nutrients over time.

  • plantRepotting

    Snowmound Spirea, being a larger shrub, is commonly planted outdoors and doesn't normally require repotting. Once planted in the ground, it should not need to be repotted but may require occasional replenishment of mulch and soil nutrients.

  • water dropsHumidity & Misting

    Snowmound Spirea tolerates a wide range of humidity conditions and does not have strict humidity requirements. It can thrive in average outdoor humidity levels, making it a resilient choice for many garden settings.

  • pinSuitable locations

    • Indoor

      Snowmound Spirea is unsuitable for indoor growth; it's a large outdoor shrub.

    • Outdoor

      Plant in well-draining soil, full sun to light shade, water regularly.

    • Hardiness zone

      4-8 USDA

  • circleLife cycle

    'Snowmound' Spirea (Spiraea nipponica 'Snowmound') starts its life cycle as a seed or via vegetative propagation methods such as cuttings. Once germinated or rooted, the plant enters a period of vegetative growth, developing a robust root system, foliage, and woody stems. After establishing, it undergoes yearly flowering cycles typically in late spring, producing clusters of white flowers that attract pollinators. Following pollination, if conditions are favorable, seeds are produced and dispersed for the next generation. Throughout the summer and into fall, the plant continues to mature, storing energy for winter dormancy. In winter, the 'Snowmound' Spirea becomes dormant, shedding its leaves and conserving resources until the cycle restarts with spring warming temperatures.

  • sproutPropogation

    • Propogation time

      Late winter

    • Spiraea nipponica 'Snowmound', commonly known as Snowmound Spirea, is often propagated through softwood cuttings. This method is popular due to its simplicity and high success rate. The best time to take softwood cuttings is in late spring or early summer, when new growth is still supple. Cuttings should be about 6 inches (15 centimeters) in length and include several leaves. The bottom inch of each cutting should be stripped of leaves and dipped in rooting hormone to encourage root development. Then, the cuttings are planted in a well-draining potting mix and kept in a humid environment until roots have formed, which usually takes several weeks.