what growing zone is philadelphia

What Growing Zone is Philadelphia?

Philadelphia, Pennsylvania, primarily falls within USDA plant hardiness zone 7a and 7b. This means that the average minimum winter temperature in Philadelphia ranges from 0°F to 15°F. Understanding your growing zone is crucial for selecting plants that can survive the winter conditions in your area.

Understanding USDA Plant Hardiness Zones

The USDA Plant Hardiness Zone Map divides North America into zones based on average annual minimum winter temperatures. These zones help gardeners and landscapers determine which plants are most likely to thrive in a specific location. Each zone represents a 10°F difference in average minimum winter temperature.

Philadelphia’s Zone: 7a and 7b

Philadelphia’s designation as zones 7a and 7b indicates its relatively moderate winter climate compared to other parts of the country. Zone 7a experiences average minimum winter temperatures between 0°F and 5°F, while zone 7b sees temperatures between 5°F and 10°F. You can find more information about plant hardiness zones on Wikipedia.

Implications for Gardeners in Philadelphia

Knowing that Philadelphia is in zones 7a and 7b allows gardeners to choose plants that can withstand the city’s winter conditions. It’s important to select plants that are rated for these zones or lower to ensure they can survive the cold. However, microclimates within Philadelphia can also influence plant survival. Factors like proximity to buildings, sun exposure, and wind protection can create warmer or colder areas within a garden. Therefore, local experience and observation are also valuable when choosing plants.

Considerations Beyond Hardiness Zones

While the USDA plant hardiness zone is a helpful tool, it’s not the only factor to consider when selecting plants. Other factors such as soil type, sunlight exposure, and moisture levels also play a crucial role in plant success. It’s also essential to consider the specific needs of each plant species and to provide appropriate care, such as watering and fertilization.

Frequently Asked Questions

What does plant hardiness zone mean?

Plant hardiness zones are geographic areas defined to categorize regions by their average minimum winter temperatures, which determine whether certain plants can survive in those locations.

How do I find my specific growing zone in Philadelphia?

While Philadelphia largely falls into zones 7a and 7b, you can use the USDA Plant Hardiness Zone Map (available online) and enter your specific address for a more precise determination.

Can I grow plants from a higher zone in Philadelphia?

It’s risky. Plants from higher zones may not be able to tolerate the colder winter temperatures in Philadelphia. Providing extra protection, such as mulching or covering, might help, but success is not guaranteed.

Are there resources for Philadelphia gardeners?

Yes, local nurseries, garden centers, and horticultural societies often offer advice and resources specific to gardening in Philadelphia.

Does Philadelphia’s growing zone mean I can only grow certain things?

No, but it’s a good starting point. While the hardiness zone suggests which plants are most likely to survive, you can experiment with plants rated for slightly warmer zones if you’re willing to provide extra care and protection.

Summary

Philadelphia resides primarily in USDA plant hardiness zones 7a and 7b, indicating average minimum winter temperatures between 0°F and 15°F. Understanding your growing zone is essential for selecting plants that can survive the winter. While hardiness zones are a valuable tool, other factors such as microclimates, soil type, and sunlight exposure should also be considered for successful gardening in Philadelphia.