When to Plant Astilbe?
The astilbe (Astilbe x arendsii) is a flowering perennial plant that originated in Asia. The plant features compound leaves with double-serrated edges and small multi-petaled blooms. The size of Astilbe can vary widely: The plant typically grows to between 1 and 5 feet tall and 1 to 2 feet wide, according to Ohio State University's website. The astilbe grows in USDA hardiness zones 4, 5, 6, 7, 8 and 9. Astilbe planting times may vary depending upon the area and the weather. Does this Spark an idea?
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Spring Planting
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Astilbe may be planted in the spring. According to the National Gardening Association website, astilbe plants should typically be spaced from 1 to 3 feet in distance. The type of astilbe, and the size of mature growth of the plant, will have an impact on the planting. For example, dwarf varieties, which may reach only about a foot in height, can be placed much closer together than astilbe types that reach 4 to 5 feet in height.
Spring Astilbe Establishment
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When establishing astilbe plants in the spring, soil should be moist but not wet. Astilbe can be established best if planted in loosened soil of a least 1 foot in depth, or up to 15 inches deep. The plant hole should be two times as wide as the original plant container. The National Gardening Association recommends mixing in a layer of compost material. About 2 to 4 inches of compost material should be blended with existing soil.
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Fall Planting
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Astilbe can be planted in the fall, before the ground has frozen. Therefore, early fall may be preferable to late fall when starting Astilbe. Astilbe plants should be placed from 1 to 3 feet apart, depending upon the type of plant. The mature size of the plant should always be considered when planting to avoid overcrowding as the Astilbe grows.
Fall Astilbe Establishment
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When establishing astilbe plants in the fall, it may be necessary to vigorously break soil up, especially if the weather has started to turn colder. A moist (but not fully saturated) soil is best for establishing astilbe. Dig a plant hole of 1 foot to 15 inches deep. The existing soil should be supplemented with 2 to 4 inches of compost. The compost material should be well integrated with the loose soil before planting the astilbe.
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