These are USDA hardiness zones, and these are the normal low temperatures in winter for these areas. The zone system can help people determine which plants will thrive/survive in their area.
It's the expected lowest lows iirc. No point saying a plant would survive average winter temps if the lowest lows that can usually occur during the season would kill them
These are USDA hardiness zones, and these are the normal low temperatures in winter for these areas. The zone system can help people determine which plants will thrive/survive in their area.
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It's the expected lowest lows iirc. No point saying a plant would survive average winter temps if the lowest lows that can usually occur during the season would kill them