What Planting Zone is Philadelphia?
Philadelphia, Pennsylvania, generally falls within USDA plant hardiness zones 7a and 7b. This means the average minimum winter temperature in the region ranges from 0°F to 15°F. These zones are important for gardeners and landscapers because they help determine which plants are most likely to thrive in a specific location.
Understanding USDA Plant Hardiness Zones
The USDA Plant Hardiness Zone Map divides North America into 13 zones based on average annual minimum winter temperatures. Each zone is further divided into “a” and “b” subzones, providing more localized information. This system helps gardeners select plants that can withstand the typical winter conditions of their area.
Philadelphia’s Specific Zones: 7a and 7b
Philadelphia’s placement within zones 7a and 7b reflects the relatively moderate winters experienced in the city and surrounding areas. Zone 7a indicates an average minimum winter temperature of 0°F to 5°F, while Zone 7b experiences temperatures between 5°F and 10°F. This subtle difference can influence plant choices, especially for marginally hardy species.
Impact on Plant Selection
Knowing your planting zone is crucial for successful gardening. Choosing plants rated for zones 7 or lower ensures they can survive the winter in Philadelphia. However, it’s also important to consider microclimates within your yard, such as sheltered areas or locations exposed to wind. These microclimates can affect plant survival, so observation and careful planning are essential.
Resources for Gardeners
Gardeners can utilize the USDA Plant Hardiness Zone Map (see: USDA Plant Hardiness Zone on Wikipedia for more information) and consult local nurseries for plant recommendations specific to the Philadelphia area. Local experts can provide valuable insights into the best varieties and planting practices for the region’s unique conditions.
Frequently Asked Questions
What happens if I plant something not suited for my zone?
If you plant something that is rated for a warmer zone (e.g., Zone 8) in Philadelphia (Zone 7), it may not survive the winter. The plant’s tissues can freeze and die, leading to its demise.
Are there any exceptions to the zone recommendations?
Yes, microclimates within your garden can create warmer or colder conditions than the overall zone indicates. For instance, a south-facing wall can create a warmer microclimate, allowing you to grow plants that are slightly less hardy.
How can I protect plants that are borderline hardy?
You can protect borderline hardy plants by mulching heavily around the base, wrapping them in burlap, or providing them with a sheltered location. Consider planting them near a wall or under the eaves of your house for added protection.
Does Philadelphia’s planting zone affect when I should plant?
Yes, Philadelphia’s planting zone impacts planting times. It’s best to wait until after the last expected frost to plant tender annuals and vegetables. Local gardening calendars and resources can provide specific planting dates for different plants.
Where can I find more information on plants suitable for Philadelphia?
Consult local nurseries, garden centers, and cooperative extension services. They can provide tailored recommendations based on your specific needs and the conditions in your area.
Summary
Philadelphia is primarily in USDA plant hardiness zones 7a and 7b, guiding gardeners in selecting plants that can withstand the region’s average winter temperatures. Understanding these zones and considering microclimates are key to successful gardening in Philadelphia.
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