Hardiness Zone Realities: Daryl Pulis on Map Accuracy & Microclimates

Daryl Pulis provides a seasoned perspective on hardiness zone maps, drawing on decades of Georgia gardening experience.

Map History & Reliability

The proposed 2003 AHS zone map was recalled before USDA endorsement—it was "such a mess." The 1990 map showing a dividing line paralleling GA-400 for Zones 7a/7b remains "pretty accurate for my part of the world." Lower elevations east of GA-400 (Lake Lanier, Chattahoochee, Suwanee) create genuinely warmer pockets.

Similarly, parts of Hall County north of Gwinnett but east of the lake sit at lower elevations and run warmer.

Problems with the 2003 AHS Map

• Ignored many years of records, focusing only on 1986-2002
• Dropped the "a" and "b" sub-zone designations
• Result: Pulis is technically 7a (1990 map), microclimatically 6b, but the 2003 map places him in Zone 8—"Ridiculous!"

Practical Client Advice

• Inside the Perimeter (serious gardeners): Consider yourself Zone 8 with cautions.
• Outside the Perimeter / non-gardeners: Stick with Zone 7.
• Zone pushing: Useful if you have your heart set on a specific plant.

J.C. Raulston's Philosophy

"The cost of a plant is approximately equal to the cost of a good dinner out. The dinner is with you for a couple of hours. The plant may only survive a few years, but for the cost of a dinner out, who cares? Enjoy it for the few years and then get another!"

This perspective liberates gardeners to experiment without guilt—plant loss is just the cost of a nice meal.