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Spiraea / s p aɪ ˈ r iː ə /, [1] sometimes spelled spirea in common names, and commonly known as meadowsweets or steeplebushes, is a genus of about 80 to 100 species [2] of shrubs in the family Rosaceae.
Deadheading is a widespread form of pruning, [1] since fading flowers are not as appealing and direct a lot of energy into seed development if pollinated. [2] The goal of deadheading is thus to preserve the attractiveness of the plants in beds , borders , containers and hanging baskets , as well as to encourage further blooming.
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Spiraea tomentosa grows to up to four feet high and prefers moist to wet soil and full sun. It blooms in summer. Each tiny, pink flower is about 1/16 of an inch wide and arranged in narrow, pyramid-shaped flowerheads that grow up to eight inches long. The flowers are followed by small, dry, brown fruit.
Spiraea betulifolia is a species of flowering plant in the family Rosaceae. It is native from Eastern Siberia to Korea and Northern and Central Japan. [1] [2]
Spiraea douglasii is a woolly shrub growing 0.91–1.83 metres (3–6 feet) tall from rhizomes, forming dense riverside thickets. [6] The leaves are 2.5–10.2 centimetres (1–4 inches) long and toothed towards the tips. They are alternately arranged, and the undersides are whitish with prominent veins.
Spiraea salicifolia, the bridewort, willow-leaved meadowsweet, spice hardhack, or Aaron's beard, is a species of flowering plant in the family Rosaceae. [2] A shrub, it is native to east-central Europe, Kazakhstan, all of Siberia, the Russian Far East, Mongolia, northern China, Korea, and Japan, and it has been widely introduced to the rest of Europe and to eastern North America. [1]
Spiraea splendens is a shrub of the rose family native to the western mountains of North America, from California to British Columbia, commonly known as dense-flowered spiraea, [citation needed] rose meadowsweet, [4] rosy spiraea, [citation needed] subalpine spiraea, [4] and mountain spiraea.