The U.S. Department of Agriculture (USDA) recently released a new version of its Plant Hardiness Zone Map (PHZM), the first update since 2012. This valuable resource helps gardeners and farmers determine which plants are most likely to thrive in their location based on average annual minimum winter temperatures.
What’s New in the 2023 PHZM?
- Updated data: The 2023 map is based on 30 years of data from 1991-2020, compared to the 1976-2005 data used in the 2012 map. This longer timeframe provides a more accurate representation of recent climate trends.
- Increased precision: The map now includes half-zones, which allows for even more specific recommendations for plant selection.
- Shifting zones: As a result of climate change, some zones have shifted northward, while others have shifted southward.
Here are some of the key takeaways from the new map:
- Warming trend: The overall trend shows a warming climate, with many zones moving northward or expanding in size.
- More variability: The new map also reveals more variability in temperatures within each zone, highlighting the importance of considering local microclimates when selecting plants.
- Greater impact of urbanization: Urban areas tend to be warmer than surrounding rural areas, which can create microclimates that are suitable for plants that are not typically hardy in the zone.
What does this mean for short-term rental/Airbnb owners?
The new PHZM provides valuable information for selecting plants that are most likely to thrive in your location. Here are some tips for using the map:
- Identify your zone: Find your location on the map and determine your zone and half-zone.
- Research plants: Choose plants that are recommended for your zone or a slightly warmer zone.
- Consider microclimates: Pay attention to factors like wind, sun exposure, and slope, which can affect the local temperature and suitability of a plant.
- Monitor trends: Be aware of how climate change may be impacting your zone and adjust your plant choices accordingly.
Additional Resources:
- USDA Plant Hardiness Zone Map
- Interactive Plant Hardiness Zone Map
- USDA Plant Database
By using the 2023 PHZM and other resources, you can make informed decisions about plant selection and help ensure the success of your garden or farm.