Overview
Spiraea Snowmound is a spectacular deciduous shrub that transforms gardens into winter wonderlands each spring. This compact, mounding variety produces masses of pure white flowers that completely cover the gracefully arching branches, creating the appearance of fresh snow draped across the landscape. Beloved by gardeners for its reliable performance and stunning seasonal display, Snowmound is an exceptional choice for those seeking low-maintenance beauty with maximum impact.
Size and Form
Mature height: 1.0-1.5 metres
Mature spread: 1.0-1.5 metres
Growth habit: Dense, mounding with gracefully arching branches
Growth rate: Moderate to fast-growing
Foliage
Leaf colour: Blue-green in summer, turning yellow-orange in autumn
Leaf shape: Small, oval leaves with serrated edges
Texture: Fine to medium texture
Flowers
Bloom time: Late spring to early summer (May-June)
Flower colour: Pure white
Flower form: Small flowers clustered in dense, rounded corymbs
Fragrance: Lightly fragrant
Pollinator friendly: Attracts bees and butterflies
Sunlight Requirements
Prefers full sun (6+ hours daily)
Tolerates partial shade, though flowering may be reduced
Soil Preferences
Well-draining soil essential
pH range: 6.0-7.5 (slightly acidic to neutral)
Soil type: Adaptable to most soil types including clay, loam, and sandy soils
Drought tolerant once established
Climate and Hardiness
UK fully hardy
RHS hardiness rating: H6 (hardy to -20°C)
Excellent cold tolerance
Moderate heat tolerance
Planting Instructions
Best planted in spring or autumn
Dig a hole twice the width of the root ball
Plant at the same depth as in the container
Space plants 2-3 metres apart for hedging, or as specimen plants
Watering
Water regularly during first growing season to establish roots
Once established, requires minimal watering except during prolonged drought
Prefers consistent moisture but not waterlogged conditions
Fertilising
Apply a balanced, slow-release fertiliser in early spring
Alternatively, use compost or well-rotted manure as a spring mulch
Avoid over-fertilising, which can reduce flowering
Pruning
Prune immediately after flowering (June-July) to avoid removing next year's flower buds
Remove up to one-third of oldest canes annually to maintain vigour
Light shaping can be done throughout the growing season
Remove dead, damaged, or crossing branches as needed
Garden Design Applications
Specimen plant for focal points
Mixed shrub borders and foundation plantings
Informal hedging and screening
Cottage garden settings
Wildlife gardens
Mass plantings for dramatic effect
Pairs beautifully with purple-flowered shrubs like lilacs or buddleia
Complements spring bulbs such as daffodils and tulips
Works well with perennials like hostas, astilbe, and heuchera
Effective with evergreen conifers for year-round structure
Common Issues
Aphids: Treat with insecticidal soap or encourage beneficial insects
Powdery mildew: Ensure good air circulation and avoid overhead watering
Poor flowering: Usually caused by insufficient sunlight or incorrect pruning timing
Spring: Apply fertiliser and fresh mulch, begin regular watering schedule
Summer: Deadhead spent flowers if desired, monitor for pests
Autumn: Enjoy autumn colour, collect leaves for composting
Winter: Minimal care required, prune if necessary during dormancy
Spiraea Snowmound offers exceptional value for gardeners seeking reliable, low-maintenance beauty. Its spectacular spring flower display rivals that of much more expensive ornamental trees, whilst its compact size makes it suitable for gardens of all sizes. The plant's excellent cold hardiness and drought tolerance make it particularly valuable for challenging growing conditions.
The shrub's dense, mounding habit provides excellent structure in the garden, whilst its graceful arching branches add natural elegance to any landscape. With minimal care requirements and outstanding seasonal interest, Snowmound represents one of the finest choices in flowering shrubs for the British garden.
Perfect for gardeners who want:
Spectacular spring flowering display
Low-maintenance shrub
Wildlife-friendly plantings
Reliable cold-hardy plants
Versatile landscape applications
Buying Shrubs from Jacksons Nurseries
At Jacksons Nurseries we sell a variety of shrubs both evergreen and deciduous with a variety of flowering times throughout the year. At certain times of the year our shrubs you buy from us may not look like the images shown on our website when deciduous leaves have fallen, the shrub has finished flowering or has been trimmed back.
Some leaves on evergreen shrubs can be damaged in winter by frost or harsh winds but in spring new leaves will readily replace those damaged. This is quite normal on many evergreen varieties and is preferable to plants grown with excessive protection that show cold shock once planted out and establish less satisfactory initially.
Availability: Stock availability figures are provided as a guide only. There is a delay between orders being placed and the plants being gathered by our pulling team. During this time it may be possible for a member of the public to purchase these plants from our Garden Centre, while this is rare it is a possibility and we will notify you of any problems as soon as possible. This figure may also include plants that have not yet be flagged as unsaleable.
Pre-order: Pre-order times are given as a guide only and may vary dependent on the growing season. Orders containing Pre-ordered products will be shipped as a single order when all items become available. Large orders may be part shipped, please contact us on 01782 502741 or email sales@jacksonsnurseries.co.uk.
* Please Note: Shrubs in 20 litre pots and above might require a pallet delivery starting at £79.99 per pallet. Depending on the exact pot size and height it may be possible to get approximately 5 plants per pallet at no extra cost. The maximum height we can dispatch on a pallet is 2.0m, this includes the height of the pallet and pot.
Shrubs are deciduous or evergreen woody plants, and often provide fragrant flowers, berries and foliage. They are good for structural framework, and they can provide a wonderful shelter and food source for wildlife.
Planting and Conditions
Container grown shrubs can be grown at any time of year. It is a little known fact that shrubs planted in the autumn and winter will be easier to look after than those planted in the spring and summer, because they will have time to establish and become hardy in the cooler months.
Plant the shrub at the same depth as it was in its original pot. Planting too deeply can result in root and stem rot.
One of the biggest causes of death in new shrubs is drought stress, so keep it well watered until it’s established.
Make sure you loosen the soil prior to planting. Most shrubs are tolerant of most soil types as long as it is fairly well draining.
Most shrubs will grow happily in containers, but they will be much more demanding on feeding and watering than shrubs in the ground would be. They will also need potting on every couple of years so that they don’t suffocate or become stunted in their pot.
Aftercare and Pruning
Once established, shrubs generally do not require much water. However, at first they need careful, frequent watering and should not be left to dry out.
Shrubs in the ground are generally not demanding and in most cases, annual feeding with general purpose fertilizer will suffice. Shrubs in containers may need more feeding; usually from early spring until late summer.
Shrubs also benefit from mulching in order to supress weeds, conserve moisture and provide vital nutrients. Mulch also greatly improves soil conditions. Shrubs can be mulched in late winter, after fertiliser has been applied, but it can be mulched through autumn to late spring as long as the ground is damp.
All shrubs benefit from dead-heading once spent flowers become apparent. Rhododendrons and Lilac especially benefit from the removal of dead flowers.
Some shrubs may show signs of reverted growth or ‘sporting’. This is where random shoots of different leaves associated with the plant’s parentage begin to appear. Most commonly this is where plants with variegated leaves sprout pure green growths instead of variegated ones.
To control reversion, remove reverted shoots promptly to discourage them. Reverted shoots are usually much more vigorous than the variegated ones, and thus should be completely pruned out and cut back into wood containing variegated foliage.
Potential Issues
Although shrubs are usually very robust garden plants, they can sometimes start to decline with no apparent or obvious reason.
This will start with browning leaves, which could indicate plant stress due to lack of water or waterlogging, an establishment failure or, in the worst case scenario, honey fungus. Another cause of leaf browning is a high salt content in the soil. This could be a natural occurrence, especially if you live near the ocean, or it could be from over fertilisation.
To remedy a high salt content, cut back on fertiliser and step up your watering regime for the next few weeks. If you live by the ocean, this will be harder to remedy—but stepping up your watering will help to wash some of the salt away all the same.
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