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Printer Friendly Version. Understanding the USDA planting zones you live in can mean the difference between success and failure in your garden. Planting plants, vegetables and flowers that are appropriate for your US growing zone will make sure that your garden is happy and healthy year after year.
Zone guide for planting bulbs. 1  Zone 1 â 4 plant bulbs between late August and late September. 2  Zone 4 â 7 plant bulbs from late September through to November or December.