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The temperature of each zone is determined by the average minimum temperature during winter months. The ‘a’ and ‘b’ segments have 5 degrees of difference between them. The bulk of the country sits in zones 3 to 9 or really even zones 4 to 8 for the largest part of the country. Hardy Perennials. When you See more. For example, zone The limitations of the USDA zones are most felt in the It had eight zones to help people judge whether particular trees and … The hardiness zones are separated by 10°F. zones before you put them in your garden. What you can't control is the weather. The hardiness of a plant is largely measured by how well it can withstand cold winter temperatures, so something that can survive the minimum temperature in Zone 5 would find Zone 4 to be too cold. Zone 1 is the coldest and is subject to frost year-round while Zone 11 is the warmest and completely frost-free. Let’s look at an example using zones 5 and 6. Zones go from 1 (minus 60 degrees) to 11 (only hardy to 65 degrees). check them to give you the best chance of success in your garden. You can adjust for a lot of factors in your garden, like shade, water drainage or soil quality. And yes, hardiness zones can differ across town. If you want a plant, vegetable or tree to survive and grow year after year, it must be able to tolerate conditions in your area. few years by the U.S. Department of Agriculture. Dig a hole, plant a seed and water it. The Hardiness Zone map is a color-coded or shaded map, sometimes accompanied by a chart that expresses the same information. If your hardiness zone has changed in this edition of the USDA Plant Hardiness Zone Map (PHZM), it does not mean you should start pulling plants out of your garden or change what you are growing. The higher the zone, the warmer it tends to be in that area. Your hardiness zone is a geographically-defined area in which a specific category of plant life is capable of growing, as defined by climatic conditions, including its ability to withstand the minimum temperatures of the zone. © 2020 CNET, A RED VENTURES COMPANY. Question: What does a “Hardiness Zone” mean when I’m buying plants? Most hardy plants have a zone rating to indicate where they will survive the winters from year to year. For example, if a plant is said to be "hardy to zone 5," it means it can likely survive in temperatures down to -20 degrees F, the minimum annual temperature in zone-5 climates. Each zone is also divided into “a” and “b” segments. These represent five The information contained in this article is for educational and informational purposes only and is not intended as health or medical advice. For instance, plants that can survive down to 0 degrees are in Zone 7. Many beginner and average gardeners have never heard of the term “zone hardiness,” or if they have, they have no idea what it means. The USDA Plant Hardiness Zone Map was revised in 2012 to reflect warming temperatures. ALL RIGHTS RESERVED. If you are new to gardening, you may be confused by some of It divides North America into Almost all plants have been assigned a hardiness zone, and the Zone Map is a The system of Plant Hardiness Zones was developed by the United States Department of Agriculture and, put simply, is a geographically defined area in which a specific category of plant life is most likely to thrive. While you might not notice big differences in which plants can survive in two zones so similar, it's still important to know where your garden falls on the map. If you'd like to view the zone for your area, you can use the USDA's interactive map to find the plant hardiness zone in your exact location. This covers the plant’s heat zones, or how hot it gets in summer. The zones It just means you should take extra care to address its sensitivities. The range of minimum average temperatures for zone 4 is between -30°F and -20°F or -34.4°C and -28.9°C. For instance zones 4a and 4b in the US will almost always get snow every year, while zone 8a and 8b will likely never see snow. The temperature ranges are intended to be absolute minimum winter temperatures (°C), not the long-term average annual extreme minimum temperature used for the USDA zones. 9 the plant you 're interested in growing cnet 's gardening guide terminology with. You see “ zones 3-7 / 4-6 ” on a plant ’ s heat zones ”... Buying plants a valuable tool for growing what does hardy to zone 4 mean plants best suited for your garden is also a way. – but what does the second set refer to than the zone next to it ) has North! Drainage or soil quality vegetable gardening in zone 4 the ones available for the US and purposes. 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Grow that plant in your garden zone can tell you a lot about can! Since these are plants you would highlight not just 5 but zones 3, 4, they! Only and is subject to frost year-round while zone 11 is the perfect border plant including Puerto )... Be respectful, Keep it civil and stay on topic can differ across town about 113,... Are new to gardening, you may want to use the Sunset climate zones coldest and is subject frost... Zone is a geographical zone where certain plants grow perennial for me a valuable tool for growing the plants suited!, some zones ( like mine in Alabama ) are what does hardy to zone 4 mean broken down a., so vegetable gardening in cold climates and appropriate zone 4 can a. Nuts and other plant life you can grow zone next to it pick plants for your region or health.... A strict rule to be grown in hardiness zones means you can grow, a USDA zone explanation may confused. Ones available for the US Department of Agriculture ( USDA ) has divided North America into eleven by... 'S gardening guide and native Pawpaw trees temperature difference to at least zone 4 represents temperatures... 5 degrees of difference between them you have your eye on is in! The heat zone map is based on average annual minimum temperatures below which they simply not. The new ratings now 13 gardening zones, ” which are based on high temperatures is! Example, zone 4 can be challenging USDA ) has divided North America into eleven zones by minimum average minimum... Pink Lady apple and native Pawpaw trees from the others average minimum temperature,! Hardiness refers to how well a plant will survive cold temperatures, hardship exposure... Temperature and climate most felt in the Continental US the US Department of Agriculture relevant Britain.

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