Pruning may be needed to remove dead branches, encourage bushier growth, promote more flowers, or maintain a specific size or shape. Join now. You can also shape the shrub at this time. Spiraea japonica 'Shirobana'. The plant produces white and pink flowers in the summer. Spirea japonica 'Shirobana' Overall Description A very interesting, and attractive summer blooming spirea with a handsome, mounding growth habit. Spiraea spirea can be pruned by pinching, thinning, shearing or rejuvenating. It’s important to prune spirea shrubs, as this helps maintain their shape, prevent diseases, and encourage a second flowering. Spiraea spirea is native to China and Japan. Its leaves are green and grow up to 3 inches long. Spiraea japonica growth habit Leonora Enking CC-BY-SA 2.0 Spiraea japonica flower and leaf detail Milada CC-BY-SA 2.0 'Neon Flash' Flower Form Jim Robbins CC BY-NC-ND 4.0 'Shirobana' Flower Form Jim Robbins CC BY-NC-ND 4.0 Flower Close-up (Wake County, NC) Cathy Dewitt CC BY 4.0 Form (Wake County,NC) Cathy Dewitt CC BY 4.0 This removes the dead blossoms and also may trigger a second blooming and new leaf growth. The dense, compact habit, large clusters of late spring and summer flowers in pink or white, with excellent fall color provides many seasons of care-free enjoyment in the landscape. Spirea Pink (summer blooming), includes A. W., Daphne, Dolchica, Goldflame, Goldmound, Limemoumd, Little Princess, Magic Carpet, Neon Flash, Norman, Shirobana and Japanese White. Give it a good trim after it flowers in the spring by cutting back the tips of the stems to the top leaf bud. Don’t be afraid to really cut the plant back, as these shrubs will grow back even from severe pruning. Spiraea japonica 'Shirobana' Joseph's coat Join the RHS today and get 12 months for the price of 9. Spiraea japonica. Spiraea Japonica 'Anthony Waterer' left has lovely pale red flowers, compact and upright it grows up to 1m and is fully hardy, illustrated in the first image top left. Shirobana spirea, scientifically known as Spiraea japonica 'Shirobana', is a deciduous shrub. Remove 50% to 75% of the top of the shrub maintaining a mounded form. Prune these shrubs in early spring before they leaf out. Height and spread: 1 to 2 feet tall, 2 feet wide. This low-growing mounded spirea shrub is ideal for creating eye-catching borders that provide continual interest. First, use gardening shears to remove any damaged or diseased stems, right back to the base. 'Shirobana' Japanese Spirea. Bloom time: Early summer through fall. You should actually prune your spirea more than once a year, at least twice. Japanese spirea (Spiraea japonica), grown in U.S. Department of Agriculture plant hardiness zones 3 through 9, blooms on the year's new growth and must be pruned in late winter or early spring before new growth and buds begin. How to Prune Spirea. Location near campus: in center portion of Xeriscape Garden; the Xeriscape Garden is located at the northwest corner of National Avenue and Linwood, about 3/4 mile south of campus. Zones: 3-8. This spirea variety commonly displays three different colored blooms all on the same shrub - and all at the same time!! When pruning to control a plant's size or shape, cuts should be made just above a leaf bud and at a slight angle. Pruning Instructions. Japanese spirea is a favorite of many gardeners, offering a wide range of sizes and cultivars. Dead branches should be removed close to the trunk, flush with the bark. Rosaceae (Rose Family) flowering shrub flowers leaves and faded flowers. 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