Spiraea japonica (Japanese Spiraea) is a group of compact, deciduous shrubs prized for their vibrant summer flowers, colourful foliage, and tidy, easy-to-grow nature. Mixed varieties may include pink, red, or white flowering forms, as well as gold- or green-leaved types. These shrubs are ideal for borders, rockeries, low hedges, and mixed beds, providing reliable colour with very low maintenance.
Planting & Position
Light:
Grows best in full sun to light partial shade.
Full sun encourages strong flowering and brightest foliage colours.
Soil:
Thrives in moist, well-drained soil.
Tolerant of a wide range of soil types including sandy, loamy, and clay soils.
Avoid very waterlogged spots.
Spacing:
Most varieties mature at 40–80 cm tall and 60–100 cm wide.
Space accordingly if planting a mixed group.
Planting time:
Plant in spring or autumn for best root establishment.
Care & Maintenance
Spiraea japonica is extremely low-maintenance — ideal for busy gardeners.
Watering:
Water well during the first growing season.
Once established, very drought-tolerant, needing water only in long dry spells.
Feeding:
Feed in early spring with a balanced shrub fertiliser to boost new growth.
Mulch annually with compost to maintain soil health.
Pruning:
Prune in late winter or very early spring.
Cut back old flower heads and lightly trim to encourage fresh shoots.
For compact shape: reduce stems by one-third annually.
Hard prune older plants to 15–20 cm from the ground to rejuvenate.
Hardiness:
Fully hardy in all parts of Ireland and the UK.
Seasonal Interest & Uses
Flowers (Summer):
Flat clusters of blooms appear from late spring into summer.
Colours vary depending on mix: pink, red, rose, or white.
Foliage:
Fresh green or golden foliage depending on variety.
Some varieties produce bronze-red spring shoots or rich autumn tones.
Shape:
Naturally compact, rounded shrubs perfect for mixed planting.
Ideal for:
Front of borders
Low informal h
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Average Seeds Per Pack: 100