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A plant may be described as "hardy to zone 10": this means that the plant can withstand a minimum temperature of 30 to 40 °F (−1.1 to 4.4 °C). Unless otherwise specified, in American contexts "hardiness zone" or simply "zone" usually refers to the USDA scale.
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Thus a plant's ability to tolerate cold, heat, drought, flooding, or wind are typically considered measurements of hardiness. Hardiness of plants is defined by their native extent's geographic location: longitude, latitude and elevation. These attributes are often simplified to a hardiness zone.
The wetter season occurs from November through March. The average annual rainfall over the ten years from 1997/98 through 2006/07 was 8.97 inches (228 mm). The city falls within USDA plant hardiness zones 9a (20 to 25 °F; −7 to −4 °C) and 9b (25 to 30 °F; −4 to −1 °C). [21] [22]
Portland's USDA Plant Hardiness Zone is 8b, with parts of the Downtown area falling into zone 9a. [88] Winters are cool, cloudy, and rainy. The coldest month is December with an average daily high temperature of 46.9 °F (8.3 °C), although overnight lows usually remain above freezing by a few degrees.
These maps show a scale, or index of greenness, based on several factors: the number and type of plants, leafiness, and plant health. Where foliage is dense and plants are growing quickly, the index is high, represented in dark green. Regions with sparse vegetation and a low vegetation index are shown in tan.
The workflow is a steady cycle of planting and harvesting right through the growing season, and usually comes to an end in the cold winter months. A somewhat larger market garden operation, ranging from 10 to 100 acres (4.0 to 40.5 ha; 40,000 to 405,000 m 2 ), may be referred to as intensive mixed vegetable production, although the essential ...
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