On the season premiere of We Dig Plants, hosts Alice Marcus Krieg and Carmen Devito introduce a new series examining the USDA Plant Hardiness Zone Map, taking you across the country one zone at a time. The map is the standard by which gardeners and growers can determine which plants are most likely to thrive at a location. The map is based on the average annual minimum winter temperature, divided into 10-degree F zones.

This week, we're joined by Scott Appell of Puerto Rico's Zone 13, and Tobias Koehler of Hawaii's Zone 12.

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