The USDA released a new Plant Hardiness Zone chart in February of 2012 that tries to account for how well a particular plant will do when grown in a particular area by averaging out the minimum temperatures across the country into thirteen bands with a 10-degree spread in. Method 2: Chilling hours were calculated by counting the number of hours at or below 45 degrees F, from October 1st through February 28th/29th. The Plant Hardiness Zones are an approximation of the maximum amount of cold weather a plant can tolerate over winter. Method 1: Chilling hours were calculated by counting the number of hours between 32 and 45 degrees F, from October 1st through February 28th/29th. Several methods exist for calculating chilling hours two are presented here. For chilling hour data from past years, see the table below. Temperatures can fluctuate from one location to another, however, so the number of chilling hours at your peach orchard may be different than what we have recorded here. Sit in and Take Away restaurant situated on Durban's Golden Mile. 3,125 likes 10 talking about this 13 were here. To see chilling hours for other areas in the state, please visit, select the location nearest you, then click the Chill Units button. The Chill Zone - Pizza & Ice Cream, Durban, KwaZulu-Natal. This table shows chilling hours as recorded at the Overton Center. Chilling hours are calculated as a tool for fruit producers to gauge whether their crop has been exposed to cold temperatures for a long enough time period. For dormant buds of fruit trees, this is commonly referred to as the chilling requirement. The dormant buds of many plants require a period of cold weather to grow, flower, and develop properly, but requirements vary widely by species.
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