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The leaves turn yellow in Autumn. The flowers are wind-pollinated catkins 3–6 centimeters (1 + 1 ⁄ 4 – 2 + 1 ⁄ 4 in) long, the male catkins pendulous, the female catkins erect. The fruit is unusual among birches in maturing in late spring; it is composed of numerous tiny winged seeds packed between the catkin bracts. [2] [6] River birch ...
In the United States, most of the warmer zones (zones 9, 10, and 11) are located in the deep southern half of the country and on the southern coastal margins. Higher zones can be found in Hawaii (up to 12) and Puerto Rico (up to 13). The southern middle portion of the mainland and central coastal areas are in the middle zones (zones 8, 7, and 6).
Paper birch grows best in USDA zones 2–6, [10] due to its intolerance of high temperatures. Betula nigra, or river birch, is recommended for warm-climate areas warmer than zone 6, where paper birch is rarely successful. [24] B. papyrifera is more resistant to the bronze birch borer than Betula pendula, which is similarly planted as a ...
In the United States, Lagerstroemia indica is a very popular flowering shrub/small tree in mild-winter states (USDA Zones 6–10). [6] Low maintenance needs make it a common municipal planting in parks, along sidewalks, highway medians and in parking lots.
The most cold-tolerant trees originate in the northwest of the species' range in Kashmir and Paktia Province, Afghanistan. Selected cultivars from this region are hardy to USDA zone 7 or even zone 6, tolerating temperatures down to about −30 °C (−22 °F). [15]
Various hardiness ratings are published. In the United States (US), the most widely used is the U.S. Department of Agriculture (USDA) system of hardiness zones based on average minimum yearly temperatures. [4] This system was developed specifically for the extremely diverse range of conditions in the US, from baking desert to frozen tundra.