Growing garlic in zone 7b

In zone 7b, garlic goes in the ground from mid-October through late November, several weeks before hard frost, to allow root establishment without significant top growth above the soil line. Foliage resumes active growth by late February or early March as temperatures rise through the vernalization threshold. Any hardneck varieties planted in the zone will produce scapes in late April to mid-May; removing scapes promptly redirects energy to bulb development. Harvest falls in late May to mid-June, keyed to foliage: when the lower three or four leaves have fully browned, bulb wrappers have finished forming. The zone 7b last frost, typically mid-March to early April, poses no meaningful risk to overwintered garlic foliage at that point; cold-hardened plants tolerate brief late-season freezes without damage.

The main adjustment for zone 7b is managing the humid late-spring and early-summer conditions that accelerate disease development around harvest. Onion white rot, caused by Sclerotium cepivorum, is the primary soil-borne threat; it persists in soil for decades and has no chemical cure once established. Avoid planting in any bed with a white rot history, and rotate garlic out of allium plantings for at least four years. A 3-to-4-inch straw mulch applied in late November moderates soil temperature swings through winter, but pull it back in spring once consistent foliage growth resumes to reduce moisture retention at the base of the plants. Harvest promptly when foliage signals are met; leaving bulbs in zone 7b's late-spring humidity past their peak invites wrapper deterioration and fungal entry. Cure harvested bulbs in a shaded, well-ventilated space for three to four weeks before storage or braiding.